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Question
Choose the correct alternative:
`int (sec^2x)/(tan^2 x - 1) "d"x`
Options
`2 log |(1 - tan x)/(1 + tan x)| + "c"`
`log |(1 + tan x)/(1 - tan x)| + "c"`
`1/2 log |(tan x + 1)/(tan x - 1)| + "c"`
`1/2 log |(tan x - 1)/(tan x + 1)| + "c"`
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Solution
`1/2 log |(tan x - 1)/(tan x + 1)| + "c"`
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