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Suppose sin^(3)x sin3x=underset(m=0)over...

Suppose `sin^(3)x sin3x=underset(m=0)overset(n)sumC_(m) cos mx ` is an idedntity in x , where `C_(0),….C_(n)` are constant and `C_(n)ne0` then the value of n is ___________

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