Evaluate : ∫tan x dx – InterviewSolution

1.

Evaluate : ∫tan x dx

Answer»

I = ∫tan dx = ∫((sec x.tan x)/sec x) dx

Put z = sec x

dz = sec x tan x dx

∴ I = ∫dz/z = log|z| + c

= log|sec x| + c

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