Definite IntegrationHard

Question

dx equals to :

Options

A.π/4
B.π/2
C.is same as
D.cannot be evaluated

Solution

   x = tanθ
I = 
I =             .........(i)
I =        ........(ii)
(i) + (ii)
2I =         ∴      I = π/4
  x = tan θ
I =
I = =    (as above)

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