MCQ
$\int\limits_{ - \pi }^\pi {\frac{{{{\cos }^2}x}}{{1 + {a^x}}}\,\,dx,a > 0, = .........} $
- ✓$\frac{\pi }{2}$
- B$a\pi $
- C$2\pi $
- D$\frac{\pi }{a}$
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