1.

If int(e^(4x)-1)/(e^(2)x)log((e^(2x)+1)/(e^(2x)-1))dx (t^(2))/(2)logt-(t^(2))/(4)+(u^(2))/(4)+C them

Answer»

`t=E^(-X)-e^(x)u=e^(x)+e^(-x)`
`t=e^(x)-e^(-x),u=e^(x)+e^(-x)`
`t=e^(x)+e^(-x),u=e^(x)-e^(-x)`
NONE of these

Answer :C


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