1.

int (1 + tan^(2) x)/(1 -tan^(2) x)dx =

Answer»

`(sin 2X)/(2) + ` C
`- (1)/(2) ` sin 2 X + C
`(1)/(2) ` LOG | SEC 2 x + tan 2 x+ C
`(2)/(3)` log | sec x | + C

Answer :C


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