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If sin^3xsin3x=sum(m=0)^ncmcosmx, where ...

If `sin^3xsin3x=sum_(m=0)^nc_mcosmx`, where `c_0,c_1,c_2,....,c_n` are constants and `c_n!=0`, then the value of n is

A

15

B

6

C

1

D

0

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