જો $\int \frac{x+5}{x^2+4x+5} dx = a \log(x^2+4x+5) + b \tan^{-1}(x+k) + C$ હોય, તો $(a, b, k)$ ની કિંમત શોધો.

  • A
    $(\frac{1}{2}, 3, 2)$
  • B
    $(\frac{1}{2}, 1, 2)$
  • C
    $(\frac{1}{2}, 3, 1)$
  • D
    $(1, 3, 2)$

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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} = $

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