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Homework Help: Solving for x involving trig

  1. Nov 13, 2009 #1
    I have formula z(x)=2ASin(7*pi*x)Cos(3*pi*x)
    I need to find the location where the displacement is max and min.

    I understand how to get the differential z'(x)=A4piCos(4*pi*x)+A10piCos(10*pi*x)
    Then I need to find critical points... this is where I have been having the trouble. My calculator keeps telling me my dimensions don't work, and it is really killing me. How do you solve for that = 0?

    Edit: z(x) can also be written as A(Sin(4*pi*x)+Sin(10*pi*x)) if that saves you any work
    Also: x is between 0 and 1meter

    -----------Problem Solved----------
    Last edited: Nov 13, 2009
  2. jcsd
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