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If int(0)^(1)(ax+b)/(x^(2)+3x+2)dx=ln.(3...

If `int_(0)^(1)(ax+b)/(x^(2)+3x+2)dx=ln.(3)/(2)`, then

A

`a=1,b=1`

B

`a=2,b=-1`

C

`a=1,b=-1`

D

none of these

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