# How do you find the derivative of #[3 cos 2x + sin^2 x]#?

##### 1 Answer

Apr 12, 2016

#### Explanation:

**Sum rule:**

**Multiplication by constant:**

**The derivative of #cos(x)# is #-sin(x)#. You can use that here, but you will have to use chain rule.**

**The derivative of #2x# is only #2#.**

**You can use power rule on #sin^2x#, but you will have to use chain rule as well.**

**The derivative of #sin(x)# is #cos(x).**