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Math Help - help on derivative of the power of a function

  1. #1
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    help on derivative of the power of a function

    Find the derivative of s= 2x^2 (3-x^3)^6

    using product rule
    ds/dx = (3-x^3)^6(6x^2) + 2x^3(6)(-3x^2)(3-x^3)^5
    ds/dx= (3-x^3)^5(6x^2(3-x^3) -36x^5)
    ds/dx= (3-x^3)^5(18x^2-6x^5-36x^5)
    (3-x^3)^5(18x^2-42x^5)

    I can't get the answer (3-x^3)^5 (12x-40x^4)
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