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

1.	\int _ { 0 } ^ { \frac { \pi } { 4 } } \frac { \operatorname { sin } x \operatorname { cos } x } { \operatorname { cos } ^ { 4 } x + \operatorname { sin } ^ { 4 } x } d x
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