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Homework Help: - need derivative help

  1. Mar 25, 2010 #1
    urgent -- need derivative help!!

    1. The problem statement, all variables and given/known data

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

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

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

    2. Relevant equations

    3. 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
  2. jcsd
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