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Evaluate `int(x^(2))/((x^(2)+1)(x^(2)+4))dx.` |
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Answer» `int(x^(2))/((x^(2)+1)(x^(2)+4))dx=(1)/(3)int[(4)/(x^(2)+4)-(1)/(x^(2)+1)]dx` `= -(1)/(3)int(1)/(x^(2)+1)dx+(4)/(3)int(1)/(x^(2)+4)dx` `= -(1)/(3)tan^(-1)x+(4)/(3)xx(1)/(2)tan^(-1)((x)/(2))+C` `= -(1)/(3)tan^(-1)x+(2)/(3)tan^(-1)((x)/(2))+C` |
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