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**urgent -- need derivative help!!**

## Homework Statement

f(x) = sin^3(x^2 + sinx)

f(x) = (cosx)^31^2

f(x) = sin(x^3/(cosx^3))

## Homework Equations

## The Attempt at a Solution

f(x) = sin^3(x^2 + sinx)

so i said it was 3sin(x^3+sinx) * (2x+cosx)

f(x) = (cosx)^31^2

i said this was the same as (cosx)^961, so 961(cosx)^960?

f(x) = sin(x^3/(cosx^3))

i said this was the same thing as sin(x^3cosx^-3), so cos(x^3cosx^-3) * (3x^2(cosx^-3) * (x^3(-3sinx^-4)?

please respond quickly, i have a fast deadline, gah thanks in advance