1.

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

Answer»

`(1)/(SQRT(2))log|(1)/(1-x)-(1)/(2)+sqrt((1)/(1-x)^2-(1)/(1-x)+(1)/(2))|+c`
`(1)/(sqrt(2))log|(1)/(1-x)+(1)/(2)+sqrt((1)/(1-x)^2-(1)/(1-x)+(1)/(2))|+c`
`(1)/(sqrt(2))log|(1)/(1-x)-(1)/(2)-sqrt((1)/(1-x)^2+(1)/(1-x)+(1)/(2))|+c`
`(1)/(sqrt(2))log|(1)/(1-x)+(1)/(2)+sqrt((1)/(1-x)^2+(1)/(1-x)+(1)/(2))|+c`

ANSWER :A


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