Answer:

Step-by-step explanation:
Given

See attachment for distribution
Required

This is calculated as:

Using the data on the frequency distribution table, we have:


A plane has two dimensions and extends infinitely in both dimensions.
Answer:

We know that
and using this identity we have:


And if we remember the equation above represent the fundamental identity in trigonometry and is satisfied for every real number and we can say that the solution for this case is:
![A= [X | x \in R]](https://tex.z-dn.net/?f=%20A%3D%20%5BX%20%7C%20x%20%5Cin%20R%5D)
Step-by-step explanation:
For this case we have the following equation given:

We know that
and using this identity we have:


And if we remember the equation above represent the fundamental identity in trigonometry and is satisfied for every real number and we can say that the solution for this case is:
![A= [X | x \in R]](https://tex.z-dn.net/?f=%20A%3D%20%5BX%20%7C%20x%20%5Cin%20R%5D)
Using the Pythagorean identity, the value of the cosine ratio is 
<h3>How to determine the cosine ratio?</h3>
The given parameter is:

By the Pythagorean identity, we have:

So, we have:

This gives

Evaluate

Take LCM

This gives

Take the square root of both sides

Cosine is positive in the fourth quadrant.
So, we have:

Hence, the cosine value is 
Read more about Pythagorean identity at:
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