1.

int (1)/((x+1)sqrt(x^(2)+x+2)dx=

Answer»

`(1)/(SQRT(2))Cosh^(-1)((3-x)/(sqrt(7)(x+1)))+c`
`-(1)/(sqrt(2))Cosh^(-1)((3-x)/(sqrt(7)(x+1)))+c`
`-(1)/(sqrt(2))Cosh^(-1)((3+x)/(sqrt(7)(x-1)))+c`
`-(1)/(sqrt(2))Cosh^(-1)((3-x)/(sqrt(7)(x-1)))+c`

Answer :B


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