જો $\sin^3 x \sin 3x = \sum_{m=0}^n c_m \cos mx$ હોય,જ્યાં $c_0, c_1, c_2, \dots, c_n$ અચળાંકો છે અને $c_n \neq 0$,તો $n$ ની કિંમત શોધો.

  • A
    $15$
  • B
    $6$
  • C
    $1$
  • D
    $0$

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