# Can You solve this? You are great then. Feel Proud

Calculus Level 3

$\int _{ -\pi }^{ \pi }{ \frac { { \left( \cos { x } \right) }^{ 2 } }{ 1+{ a }^{ x } } } \ \mathrm dx$

For a constant $$a > 0$$, evaluate the integral above.

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