यदि $\sin^4 \theta \cos^2 \theta = \sum_{n=0}^{\infty} a_{2n} \cos 2n \theta$ है,तो $n$ का न्यूनतम मान जिसके लिए $a_{2n} = 0$ है,होगा

  • A
    $1$
  • B
    $2$
  • C
    $3$
  • D
    $4$

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