1.

`int_(0)^(pi//2)(dx)/((1+sqrt(tanx)))=(pi)/(4)`

Answer» `I=int_(0)^(pi//2)sqrt((sinx)/(cosx))/((1+sqrt((sinx)/(cosx))))dx=int_(0)^(pi//2)(sqrt(sinx))/((sqrt(sinx)+sqrt(cosx)))dx`


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