int(dx)/((-x^(2)-2x+3))...

`int(dx)/((-x^(2)-2x+3))`

A

`(1)/(4) log ((3+x)/(1-x))`

B

`(1)/(3) log ((3 + x )/(1-x))`

C

`(1)/(2) log ((3+x)/(1-x))`

D

`logg ((1-x)/(3+x))`

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The correct Answer is:

A

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[" 3."int(dx)/(sqrt(x^(2)+2x+3))=log|(x+a)+sqrt(x^(2)+bx+3)|+c" then ab "=],[[" A) "1," B) "2," C) "]]