linshan789
Integration Problem...HELP!!!



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linshan789
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dw:1361641769890:dw

linshan789
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Any ideas?

sirm3d
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use the identity \[\frac{1}{2}\cos(AB)\cos(A+B)=\cos(A)\cos(B)\]

sirm3d
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put \[A=4x, B=3x\]

TuringTest
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\[\frac{1}{2}[\cos(AB)+\cos(A+B)]=\cos(A)\cos(B)\]

linshan789
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Isn't that an identity for sin?
Is it the same for cos?


linshan789
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Cool, thanks guys.