# Differentiating trigonometric functions review

Review your trigonometric function differentiation skills and use them to solve problems.

## How do I differentiate trigonometric functions?

First, you should know the derivatives for the basic trigonometric functions:
start fraction, d, divided by, d, x, end fraction, sine, left parenthesis, x, right parenthesis, equals, cosine, left parenthesis, x, right parenthesis
start fraction, d, divided by, d, x, end fraction, cosine, left parenthesis, x, right parenthesis, equals, minus, sine, left parenthesis, x, right parenthesis
$\dfrac{d}{dx}\tan(x)=\sec^2(x)=\dfrac{1}{\cos^2(x)}$
$\dfrac{d}{dx}\cot(x)=-\csc^2(x)=-\dfrac{1}{\sin^2(x)}$
$\dfrac{d}{dx}\sec(x)=\sec(x)\tan(x)=\dfrac{\sin(x)}{\cos^2(x)}$
$\dfrac{d}{dx}\csc(x)=-\csc(x)\cot(x)=-\dfrac{\cos(x)}{\sin^2(x)}$
You can actually use the derivatives of sine and cosine (along with the quotient rule) to obtain the derivatives of all the other functions.

## Practice set 1: sine and cosine

Problem 1.1
f, left parenthesis, x, right parenthesis, equals, 2, x, minus, 3, sine, left parenthesis, x, right parenthesis
f, prime, left parenthesis, x, right parenthesis, equals

Want to try more problems like this? Check out this exercise.

## Practice set 2: tangent, cotangent, secant, and cosecant

Problem 2.1
Let f, left parenthesis, x, right parenthesis, equals, tangent, left parenthesis, x, right parenthesis.
Find f, prime, left parenthesis, start fraction, pi, divided by, 6, end fraction, right parenthesis.
After you've mastered the derivatives of the basic trigonometric functions, you can differentiate trigonometric functions whose arguments are polynomials, like $\sec\left(\dfrac{3\pi}{2}-x\right)$.