Q. 273.9( 31 Votes )

# Evaluate the definite integral:

Answer :

Given:

First solve for I1:

Let 2 tan x = t ⇒ 2 sec^{2}x dx dt

When x = 0 then t = 0 and when x = π /2 then t = ∞

Put this value in equ.(2)

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