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    how do i integrate sin^2 3x?
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    (Original post by Chelsea12345)
    how do i integrate sin^2 3x?
    try to write cos(6x) in terms of sin(3x)
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    double angle formula
    cos(6x) = 2sin^2(3x)-1


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    rearrange for sin^2(3x)
    sin^2(3x)=1/2*(cos(6x)+1)
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    (Original post by Chelsea12345)
    how do i integrate sin^2 3x?
    Express \sin^2(3x) in terms of \cos(6x) via double angle formula.
 
 
 
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