1.

int (e^(3x) + e^(x))/(e^(4x) -e^(2x)+1)dx =

Answer»

`(1)/(4) LOG (e^(4X)- e^(2x) + 1) + C `
` tan^(-1) (e^(x) - e^(-x)) + C`
`tan^(-1) (e^(x) - e^(-x))+ C`
`tan^(-1) (e^(-x) - e^(x))+ C`

Answer :B


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