જો સંકલન $\int_{-1}^1 \frac{\cos \alpha x}{1+3^x} d x$ નું મૂલ્ય $\frac{2}{\pi}$ હોય,તો $\alpha$ નું એક મૂલ્ય શોધો.

  • A
    $\frac{\pi}{6}$
  • B
    $\frac{\pi}{2}$
  • C
    $\frac{\pi}{3}$
  • D
    $\frac{\pi}{4}$

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