### Home > CALC > Chapter 6 > Lesson 6.3.2 > Problem 6-93

6-93.

Find the following derivatives. Consider trigonometric substitutions to make your work easier.

Use a trigonometric identity AFTER you find the derivative.

4cos(2

*x*)sin(2*x*) =

2sin(4*x*)Simplify the expression using a trigonometric identity BEFORE you take the derivative.

Careful!