નિશ્ચિત સંકલન $\int_{-\frac{\pi}{4}}^{\frac{\pi}{4}} \frac{d x}{\left(1+e^{x \cos x}\right)\left(\sin ^{4} x+\cos ^{4} x\right)}$ નું મૂલ્ય કેટલું થાય?

  • A
    $\frac{\pi}{\sqrt{2}}$
  • B
    $-\frac{\pi}{4}$
  • C
    $\frac{\pi}{2 \sqrt{2}}$
  • D
    $-\frac{\pi}{2}$

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