જો $\int \limits_0^\pi \frac{5^{\cos x}(1+\cos x \cos 3x+\cos^2 x+\cos^3 x \cos 3x) dx}{1+5^{\cos x}} = \frac{k \pi}{16}$ હોય,તો $k$ ની કિંમત $...........$ છે.

  • A
    $29$
  • B
    $26$
  • C
    $25$
  • D
    $28$

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