# Question #e7339

##### 1 Answer

#### Answer:

It doesn't.

#### Explanation:

Let's break this down:

#color(red)(cos(color(blue)(sin^-1(2/3)))#

The

Let's say that

In the triangle where this is true, we see that

We can draw a triangle where

Through the Pythagorean Theorem we see that the other leg is

What we want to find is

That is, we just want cosine of theta in this triangle.

Cosine is "adjacent" over hypotenuse, so: