# What is the derivative of #cos(a^3+x^3)#?

##### 3 Answers

#### Explanation:

Use chain rule for derivatives.

Consider this as

The answer would be composition of derivatives of

Derivative of

So the answer is

Now,

So back to the answer.

Ans:

Final Ans:

Just another way of saying the same thing

#### Explanation:

Let

Let

But

#### Explanation:

the main function is

the sub function is

by the chain rule

main function should differentiate first ，and then differentiate sub function

so