यदि $\int \cos ^k(x) \sin (x) d x = \frac{-1}{4} \cos ^4(x) + C$ है,तो $k$ का मान ज्ञात कीजिए।

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

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