Question

Find the derivative of f(x)=x^3cosx

Answer 1

use productr ule :
f'(x) = x^3 * -sinx + cosx * 3x^2
= x^2(3cosx - xsinx)

Answer 2

product rule is

if f(x) = f(u) * f(v)

f ' (x) = f'(u)* f(v) + f'(v) * f(u)

Answer 3

thank you (: i was just making sure i was correct.

Answer 4

ok no probs