Note that the trig expression takes on the form

, where

Recall that

Now let us set up a triangle that represents the angle

.

We see that the opposite leg has a value of x, and the adjacent has a value of 1. Thus, the value of the hypotenuse can be found after applying the Pythagorean formula:

Now, let us evaluate the expression:

can be determined from the triangle we constructed.

Thus,

Substitute this into the equation and simplify:

I'll leave the rest for you to do.

I hope this makes sense!

--Chris