Tuesday, May 9, 2017

integration - Evaluating intlimitspi/40log(1+tanx),mathrmdx



Can someone give me a hint on how to evaluate the closed form of the following integral? According to Wolfram Alpha, this evaluates to π8log(2).



π/40log(1+tanx)dx



Thanks.



p.s - Hints are preferred over complete solutions.


Answer




Hint. By the change of variable
x=π4u,dx=du,1+tanx=?log(1+tanx)=?


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