Trigonometric EquationEasy

Question

In = tann x dx then n [In + In-2] equals

Options

A.
B.1
C.∞
D.zero

Solution

tann x(1 + tan2 x)dx =tann x sec2 xdx =tndt where t = tan x
In + In + 2 = ; ⇒ n[In + In+2] =

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