Question

derivative of cos^2(x^3)

Answer 1

Use the chain rule.

Answer 2

i understand to do that but i get stuck

Answer 3

i got -2sin^2(x^3)(3x^2)
-6x^2sin^2(x^3)

Answer 4

(-6x^2)sin^2(x^3)

Answer 5

You should have a term that still has \(\cos(x^3)\) in it. Remember the chain rule: \((f\circ g)'(x)=f'(g(x))g'(x)\). If you need to, write down explicitly at each step what f, g, f', and g' are.

Answer 6

The derivative of \(\cos^2x\) is not \(-\sin^2x\). You have to use the chain rule.

Answer 7

thats what im asking for help with.