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Evaluate:`int1/(2x^2-x-1)dx` |
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Answer» `int(1)/(2x^(2)+x-1)dx` `=(1)/(2)int(1)/(x^(2)+(x)/(2)-(1)/(2))dx` `=(1)/(2)int(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|(x-1//2)/(x+1)|+C=(1)/(3)log|(2x-1)/(2(x+1))|+C` |
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