y = \operatorname { log } \operatorname { tan } ( \frac { \pi } { 4 } – InterviewSolution

InterviewSolution

1.	y = \operatorname { log } \operatorname { tan } ( \frac { \pi } { 4 } + \frac { x } { 2 } ) , \text { then show that } \frac { d y } { d x } - \operatorname { sec } x = 0
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