1.

int(dx)/((x-1)sqrt(x^2-1)) is equal to

Answer»

`-SQRT((x-1)/(x+1))+C`
`sqrt((x-1)/(x^2+1))+C`
`-sqrt((x+1)/(x-1))+C`
`sqrt((x^2+1)/(x-1))+C`

ANSWER :C


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