જો $\int \cos x \cdot \cos 2 x \cdot \cos 5 x \, dx = A \sin 2 x + B \sin 4 x + C \sin 6 x + D \sin 8 x + k$ (જ્યાં $k$ એ સંકલનનો સ્વૈચ્છિક અચળાંક છે),તો $\frac{1}{B} + \frac{1}{C} = $

  • A
    $\frac{1}{A} - \frac{1}{D}$
  • B
    $\frac{1}{A} + \frac{1}{D}$
  • C
    $1$
  • D
    $0$

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