1.

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

Answer»

`LOG((1-tanx)/(1+tanx))+C`
`log((1+tanx)/(1-tanx))+c`
`(1)/(2) log((1-tanx)/(1+tanx))+c`
`(1)/(2) log((1+tanx)/(1-tanx))+c`

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