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If sin ^(3) x sin 3x= sum (m=0)^(n) c(m)...

If `sin ^(3) x sin 3x= sum _(m=0)^(n) c_(m) cos mx` is an identity in x, where `C_(0), C_(1),C_(2),…,C_(n)` are constants and `C_(n) ne 0,` then the value of n is equal to-

A

6

B

4

C

2

D

8

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The correct Answer is:
A
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