1.

int(2)/( (e^(x) + e^(-x))^(2)) dx is equal to

Answer»

`INT(1)/( e^(X)+e^(-x))+C`
`-(e^(-x))/( e^(x)+e^(-x))+C`
`(1)/( e^(x)-e^(-x))+C`
`-(1)/(( e^(x)+1)^(-x))+C`

Answer :B


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