# Question #de1a0

##### 1 Answer

Oct 12, 2017

Substitution and chain rule

#### Explanation:

Let

For

# = -18xsin^2(cos(3x^2))cos(cos(3x^2))\times sin(3x^2)#

#=-9sin(2cos(3x^2))sin(cos(3x^2)) sin(3x^2)#