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Thread: integral of sin(3x)^2 cos(4x)^2

  1. #1

    integral of sin(3x)^2 cos(4x)^2

    Hi everyone.

    Im trying to find the integral of sin(3x)^2 cos(4x)^2, but I dont quite know where to start. I know I have to use some trig identities, but I dont know which ones to use.

    Thanks for the help!

    Matt

  2. #2
    Elite Member
    Join Date
    Sep 2005
    Posts
    7,293
    Try using the identities:

    [tex]\L\\sin^{2}(x)=\frac{1}{2}(1-cos(2x))[/tex]
    [tex]\L\\cos^{2}(x)=\frac{1}{2}(1+cos(2x))[/tex]

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