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Integration!

Calculus Level 2

\[\int { \frac { \cos { (2x) } }{ \cos { (x)+\sin { (x) } } } \, dx = \, ? }\]

\[\sin(2x)-\cos(2x)+C\] \[\sin(x)-\cos(x)+C\] \[\cos(2x)-\sin(2x)+C \] \[\sin(x)+\cos(x)+C\]

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by Mahmoud Mustafa

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