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Evaluate: int1/(2x^2+x-1)dx...

Evaluate: `int1/(2x^2+x-1)dx`

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`int (1)/(2x^(2) +x-1) dx =1/2 int(1)/(x^(2)+1/2x-1/2)dx`
`=1/2 int (1)/((x^(2) +1/2x+1/16)-((1)/(2) +(1)/(16))) dx`
`=1/2int(1)/((x+1/4)^(2)-((3)/(4))^(2))dx`
`=1/2.(1)/(2.(3)/(4))log |(x+1/4-(3)/4)/(x+1/4+3/4)|+c`
`=1/3 log |(2x-1)/(2x+2)| +c.`
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