The value of \( \int_{-\pi}^{\pi} \frac{\cos ^{2} x}{1+a^{x}} d x, ...

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The value of \( \int_{-\pi}^{\pi} \frac{\cos ^{2} x}{1+a^{x}} d x, a0 \), is
(a) \( \pi \)
(b) \( a \pi \)
P
(c) \( \frac{\pi}{2} \)
(d) \( 2 \pi \)
W
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