23. Find the exact value of cos(20) knowing that: *
(1 Point)
sin (0) = -2/2 270º < 0 < 360° how to solve

Answers

Answer 1

Answer:

[tex]\cos(2\theta) = 0[/tex]

Explanation:

Given

[tex]\sin(\theta) = -\frac{\sqrt 2}{2}[/tex]

[tex]270^o < \theta < 360^o[/tex]

Required

[tex]\cos(2\theta)[/tex]

Recall that:

[tex]\sin^2(\theta) + \cos^2(\theta) =1[/tex]

Substitute: [tex]\sin(\theta) = -\frac{\sqrt 2}{2}[/tex]

[tex](-\frac{\sqrt 2}{2})^2 + \cos^2(\theta) =1[/tex]

[tex]\frac{1}{2} + \cos^2(\theta) =1[/tex]

Collect like terms

[tex]\cos^2(\theta) =1-\frac{1}{2}[/tex]

[tex]\cos^2(\theta) =\frac{1}{2}[/tex]

[tex]\cos(2\theta)[/tex] is calculated as:

[tex]\cos(2\theta) = \cos^2(\theta) - \sin^2(\theta)[/tex]

So, we have:

[tex]\cos(2\theta) = \frac{1}{2} - (-\frac{\sqrt 2}{2})^2[/tex]

[tex]\cos(2\theta) = \frac{1}{2} - \frac{2}{4}[/tex]

[tex]\cos(2\theta) = \frac{1}{2} - \frac{1}{2}[/tex]

[tex]\cos(2\theta) = 0[/tex]


Related Questions

President Kennedy developed which of the following strategies to supplement the Cold War policies of his predecessors?

a. containment
b. massive retaliation
c. flexible response
d. detente

Answers

The answer is c. Flexible response
the answer is c, flexible response

What was Jean-Jacques Rousseau's contribution to the Enlightenment during
the 17th century?

A. His theory of separation of powers formed the basis for France's
new government.

B. He was the charismatic military leader of the rebels during the
French Revolution.

C. He mentored Napoleon Bonaparte, convincing him to experiment
with democracy.

D. His ideas on government influenced how people believed a
democracy should function.

Answers

Answer:

His ideas on government influenced how people believed a

democracy should function.(D)

Jean-Jacques Rousseau's contribution to the Enlightenment during the 17th century, was his ideas on government influenced how people believed a democracy should function. Thus, option A is correct.

Who is Jean-Jacques Rousseau?

Jean-Jacques Rousseau was a philosopher writer composer and an author, he was being enlightened with the help of various philosophic and moral values that has been there.

He fiercely endorsed the idea of freedom, fairness, and independence, for advancing the general welfare using all methods required. Even if these theories are idealistic, nevertheless are considered and have the potential to alter the contemporary dialogue.

He had various contributions in the 17th century, he also influenced a major part of a government with his ideas of democracy and equal rights as well as the various function which is there. Therefore, option A is the correct option.

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How did the scientific revolution change Europe?

Answers

Answer:

C.

Explanation:

A is just wrong

B. Cures for diseases are way more recent than that

D. Philosophy and observation normally go hand and hand  

The scientific revolution changed Europe by undermining the strength of the church and leading people to question authority in general. The correct option is C.

The scientific revolution, which occurred from the 16th to the 18th centuries, brought about significant changes in Europe's intellectual and social landscape. It was characterized by advancements in scientific knowledge, empirical observation, experimentation, and the development of new theories and methodologies. One of the key impacts of the scientific revolution was the challenge it posed to traditional religious and philosophical beliefs.

Thus, the ideal selection is option C.

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The countries identified on the map located in which two continents

Answers

Answer: in Africa and in Asia

Explanation:

You can find it in the file.

if there is a problem call me.

With Best Regards

The gentlemen

What was the purpose of the poll tax?

Answers

Answer:

In the United States, voting poll taxes (whose payment was a precondition to voting in an election) have been used to disenfranchise impoverished and minority voters (especially under Reconstruction).

The Bonus Army was made up of people from what group?

Answers

Answer: The Bonus Army was a group of 43,000 demonstrators – made up of 17,000 U.S. World War I veterans, together with their families and affiliated groups – who gathered in Washington, D.C. in mid-1932 to demand early cash redemption of their service certificates.

Caused by: Impoverishment of WWI veterans fr...

Resulted in: Demonstrators dispersed, demands ...

Location: Washington D.C., United States

Date: July 28, 1932

Which is a major way that media have historically represented people of
color?
A. As moral: People of color were often portrayed as being more
honest than whites.
B. As educated: People of color were often portrayed as being more
educated than whites.
C. As cognitive: People of color were often portrayed as having
higher values than whites.
o
D. As imitated: People of color were often played by whites made up
to look like people of color.

Answers

Answer:

D

Explanation:

Method of elimination. POC have never been portrayed as better than whites in any sense. Not as "more honest", not as "more educated", and not as "having higher values than whites". A specific example of imitation can be Jim Crow, who dressed in blackface for white entertainment.

A major way that media have historically represented people of color is as imitated. People of color were often played by whites made up to look like people of color. Thus, the correct answer is option D.

What is media?

Media refers to various forms of communication that are used to transmit information and messages to large groups of people. This includes television, radio, newspapers, magazines, social media, and other digital platforms.

Throughout much of history, people of color have been poorly represented in the media, often being portrayed in offensive and stereotypical ways. One of the most common ways in which they have been represented is through the use of blackface or other forms of makeup to make white actors look like people of color.

Therefore, a major way that media have historically represented people of color is as imitated. People of color were often played by whites made up to look like people of color. Thus, the correct answer is option D.

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Which three of the following are Important parts of the Constitution that serve to limit federal power?

A) Thirteenth Amendment
B) Fourteenth Amendment
C) Article 3
D) Article 1
E) Tenth Amendment
F) Ninth Amendment

Answers

Answer:

Explanation:

Tenth Amendment, Ninth Amendment, Amendment 14

The Federalist Papers were written by
Group of answer choices

Marshall, Jefferson, and Adams.

Washington, Adams, and Jefferson.

Madison, Hamilton, and Jay.

Jefferson, Locke, and Montesquieu.

Franklin, Washington, and Lee.

Answers

Answer:

Franklin, Washington, and Lee.

What are some design elements that the religious structures
from Islamic, Romanesque and Gothic architecture share? What
are some design features that separate these 3 eras of
architecture in terms of aesthetics?

Answers

It told me to answe but I actually don’t know anything


Select the correct answer from each drop-down menu.
Complete the paragraph about westward migration in the United States during the mid-nineteenth century.
The
faced persecution in New York and illinols. They wanted to find a place where they would be free to practice their
Therefore, they started out on a westward journey and settled near the Great Salt Lake.
Reset
Next

Answers

Answer:

The Mormons  faced persecution in New York and Illinois. They wanted to find a place where they would be free to practice their religion.

Therefore, they started out on a westward journey and settled near the Great Salt Lake.

There was a lot of religious persecution in the past and this played a major role in the establishment of the United States as we know it today. If Puritans had not been mistreated in England they might not have founded some colonies in the Americas.

Unfortunately this religious repression continued even in the United States and one such group that suffered were the Mormons. The movement started in the first half of the 19th century and after facing some persecution, they left New York and Illinois and went further westward where they could practice being Mormons in peace.

Answer:

The other person is correct! I got 100% on my test!

Explanation:

Hope this helps! (Also thank you Parrain!)

One major effect of the Hundred Years War was

Answers

Answer:

Many civilians were lost in the hundred years war

how is colonialism still integrated in our present day?​

Answers

Widely thought of as a thing of the past, colonialism is no longer front-of-thought. However, it still exists. As of today, there are seventeen territories noted as non-self-governing by the United Nations.

Which sentence best describes the effect of the Articles of Confederation on the government?
O A. It granted sovereignty to each state.
O B.
It created a powerful central government.
O C.
It limited individual freedoms.
O D.
It promoted a strong national economy.

Answers

Answer:

A. It granted sovereignty to each state.

Explanation:

Answer:

the answer is A I'm pretty sure

HURRY PLEASE IM ON A TIME LIMIT XXX
The League of Nations was a __________.
a.
group of countries that developed modern military methods
b.
peacekeeping organization formed after World War I
c.
group of baseball teams that toured the world as goodwill ambassadors
d.
undersea exploration organization with twenty thousand members

Answers

Answer : B

The league of nations was formed after the first world war in order to provide a way for nations to solve international conflicts.

Answer:

B

Explanation:

peacekeeping organization formed after World War I. This organization was created during January 10, 1920, appropriately after the Paris Peace conference had ended the first World War.

How many wings does a serafin have ​

Answers

Answer: 6

Explanation:

Exactly 6 wings and It’s written seraphim :)

PLEASE HURRY TIMED 40 POINTS Read the passage from The Odyssey - Penelope.

"My lady, never a man in the wide world
should have a fault to find with you. Your name
has gone out under heaven like the sweet
honor of some god-fearing king, who rules
in equity over the strong: his black lands bear
both wheat and barley, fruit trees laden bright,
new lambs at lambing time—and the deep sea
gives great hauls of fish by his good strategy,
his folk fare well.”

Based on the epic simile, the reader should envision Penelope as a queen who is

A - conscientious.
B - decisive.
C - judgmental.
D - righteous.

Answers

Answer:

The correc answer is that the reader should envision Penelope as a queen who is righteous.

Explanation:

Penelope is depicted as a righteous queen with no fault to be found. Her name is also associated with honor, ruling in equity and known for that accros the land. Her righteousness is also reflected by nature, bearing its fruits for her.

Answer:

Based on the epic simile, the reader should envision Penelope as a queen who is righteous.

Explanation:

A righteous person is a person that acts in right with divine or moral law, and that is free from any guilt or sin, a totally just and moral person.

Penelope is shown as a righteous queen with no fault to be found. Her name is also associated with honor, ruling in equity and known for that across the land.

Which of the following best describes who, according to Roosevelt, is entitled to these four things?

Every family in America
Every taxpayer
Everyone in America
Everyone in the world

Answers

Answer:

Everyone in the world

Explanation:

He says "The first is freedom of speech and expression–everywhere in the world."

And, "The second is freedom of every person to worship God in his own way–everywhere in the world."

And " The third is freedom from want–which, translated into world terms, means economic understandings which will secure to every nation a healthy peacetime life for its inhabitants-everywhere in the world."

And "The fourth is freedom from fear–which, translated into world terms, means a world-wide reduction of armaments to such a point and in such a thorough fashion that no nation will be in a position to commit an act of physical aggression against any neighbor–anywhere in the world."

how do the clothes we wear And food we eat depend onthe climate​

Answers

there are different temperatures so if we were in the cold we would have to wear different clothes then if we were in more hot areas

All of the following contributed to the Dust Bowl of the 1930s except a farmers' failure to use steam tractors and other modern equipment. b soil erosion. c dry-farming techniques. d unprecedented drought and wind storms of the trans-Mississippi Great Plains. e the cultivation of marginal farmlands on the Great Plains

Answers

The Anwser is the Letter A

Answer:

Definitely A Farmers' failure to use steam tractors and other modern equipment

I need help with this answer the government of sparta was different from that of most greek city states because it?

Answers

Answer:

Your selected option is correct

Explanation:

Located in the southern part of Greece on the Peloponnisos peninsula, the city-state of Sparta developed a militaristic society ruled by two kings and an oligarchy, or small group of elders that exercised political control.

The result was a rigid lifestyle unlike any seen in Greece at the time.

Wich countries remained part of the allied powers in 1942

Answers

Great Britain
Russia
France

Italy came later on. I’m assuming we’re talking about WWI?

What was one significant difference between industrialization in japan and industrialization in the United States?

Answers

Answer:

in japan thre is more technology than america nad the products of japan are preety good than america

Answer:

Japan and the United States both had very quick Industrial Revolutions.

Explanation:

Japan and the United States both had very quick industrial revolutions. The difference comes in when you see that the United States was more open to trading possibilities and opportunities while Japan closed themselves off and made their country largely inaccessible by foreign nations. Once their so called "curtain" was lifted in the mid 1800s, their country exploded with industrial prospect. In the early 1900s, Japan actually invaded Russia, seizing a large portion of territory and shocking the world, who thought Japan would still slowly be developing.

In recent years Japan has had a huge technological revolution, similar to the United States. A lot of technology comes out of Japan, same with the US.

Why were new developments in technology an important factor in the start of the industrial revolution in great Britain?

Answers

New inventions and technologies played an important role in the Industrial Revolution. They changed the way things were powered, how goods were manufactured, how people communicated, and the way goods were transported.

The US free enterprise system is based on the idea that

Answers

Answer:

Free-enterprise systems encourage free interaction between producers and consumers. Producers cannot control what they produce in a free-enterprise system. Governments create policies to protect the safety of citizens and fairness in the market. ... Businesses are generally free of government ownership and control O D.

Answer:

businesses should not be controlled by governments

President Reagan's domestic policy spent $1.7
billion to fight what issue during the 1980's?
A. The War on Drugs
B. The Space Race
C. The War on Trade

Answers

Answer: I'm pretty sure its C

Explanation:

Answer: A. The War on Drugs

Explanation:

Which action by John F. Kennedy best exemplifies the call to action in this speech?
approval of the Bay of Pigs invasion
selection of a southerner as vice president
support for a national space program
attendance at the Geneva Conference

Answers

Answer:the bay of pigs invasion

Explanation:

6. The demand curve
Price (s)
Quantity
Is downward sloping because it shows the inverse relationship between price and
quantity demanded
Is downward sloping because it shows the direct relationship between price and
quantity demanded
Is upward sloping because it shows the direct relationship between price and quantity
demanded
Is upward sloping because it shows the inverse relationship between price and
quantity demanded

Answers

The correct answer is A. Is downward sloping because it shows the inverse relationship between price and quantity demanded

Explanation

The image shows a graph in which the price ($) and the quantity are related, the relation of these two shows that a higher price leads to a lower quantity and a lower price leads to a higher quantity, so it is an inverse relationship, that is, when one of the two factors increases, the other decreases. This is reflected in a downward slop trend, that means the line goes down or it decends in the graph. According to the above, the correct answer is A. Is downward sloping because it shows the inverse relationship between price and quantity demanded

How was Christianity spread during the middle ages?

Answers

Answer:

The Christianity that was spread across Europe during the middle ages was based on the scriptures that recounted the life of the Christ and his disciples. ... The Christian Church had its own lands, laws and taxes. The Church was so influential that it too collected taxes from its followers.

Explanation:

Answer:

The Christianity that was spread across Europe during the middle ages was based on the scriptures that recounted the life of the Christ and his disciples. The Christian Church had its own lands, laws and taxes. The Church was so influential that it too collected taxes from its followers

Explanation:

what does the term manifest destiny imply​

Answers

Answer: Expansion from the Atlantic to the Pacific

Explanation:

The United States was originally 13 states on the Atlantic coast but today covers a vast area from the Atlantic to the Pacific. This is as a result of the Manifest Destiny mindset that engulfed America in the 18th and 19th century.

Those who subscribed to the Manifest Destiny believed that it was the destiny of the United States to stretch from the Eastern coast where the Atlantic was, to the Western Coast where the Pacific was.

As a result, Settlers went to the Western regions by their thousands and displaced natives, often violently, and took over their land as well as went to war with Mexico for the country to look as it does today.

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