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Homework Help: Finding the second derivative

  1. Oct 2, 2012 #1
    1. y = (sinx)^2

    2. Relevant equations

    3. The attempt at a solution

    i found the 1st deriviative.... 2(sinx)(cosx)

    and then the second derivative.... (-2(sinx)^2) + (cosx)^2

    i dont have the answer. so i wanted to know if this was right.
  2. jcsd
  3. Oct 2, 2012 #2


    User Avatar
    Homework Helper

    Not quite. Take a closer look. What's the derivative of 2(x)(x)? Using your method it would be 3x.
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