\int _ { 0 } ^ { \frac { \pi } { 4 } } \frac { \sin x \cos x } { \cos – InterviewSolution

1.

\int _ { 0 } ^ { \frac { \pi } { 4 } } \frac { \sin x \cos x } { \cos ^ { 4 } x + \sin ^ { - 4 } x } d x

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1st part

2nd part

3rd

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