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int (sec^(2) x)/( tan^(2) x - 1) dx is...

`int (sec^(2) x)/( tan^(2) x - 1) dx ` is

A

` 2 log | (1 - tan x)/( 1 + tan x )| + c `

B

` log | (1 + tan x)/( 1 - tan x )| + c `

C

` log | (1 + tan x)/( 1 - tan x )| + c `

D

` (1)/(2) log | (tan x - 1)/( tan x + 1 )| + c ` a

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The correct Answer is:
A, B, C
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