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First find the derivative by using Chain Rule.

$f'(x) =$

Next, we will find the derivative in a different way. Rewrite $f(x)$ without trigonometric functions (Hint: Set up a right triangle with a side $x$ ). When you have finished this step, $f(x)$ can be written as:

$f(x) =$

Then find the derivative of this equivalent form of $f$ .

$f'(x) =$