\( \int_{-\pi / 2}^{\pi / 2} \frac{\cos x}{1+e^{x}} d x \) का मान है (A) 1 (B) 0 (C) \( -1 \) (D...

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\( \int_{-\pi / 2}^{\pi / 2} \frac{\cos x}{1+e^{x}} d x \) का मान है
(A) 1
(B) 0
(C) \( -1 \)
(D) इसमें से कोई नहीं
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