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Cos, it's deceiving

Calculus Level 5

$\large I = \int_0^{\frac{\pi }{2}} \frac{\cos (8x) - \cos (7x)}{1 + 2 \cos (5x) } \text{ d}x$

Evaulate $\displaystyle 15I$ .

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by Sudeep Salgia

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