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Evaluate:`int(a x^3+b x)/(x^4+c^2)dx` |
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Answer» Correct Answer - `(a)/(4)log(x^(4)+c^(2))+(b)/(2)(1)/(c)"tan"^(-1)(x^(2))/(c)+k` `I=int(ax^(3)+bx)/(x^(4)+c^(2))dx ` `=int[(ax^(3))/(x^(4)+c^(2))+(bx)/(x^(4)+c^(2))]dx` `=(a)/(4)int(4x^(3))/(x^(4)+c^(2))dx+(b)/(2)int(2x)/(x^(4)+c^(2))dx ` ` " " I_(1) " "+ " "I_(2)` `=(a)/(4)log(x^(4)+c^(2))+(b)/(2)int(dt)/(t^(2)+c^(2)) " " (" in " I_(2), " put " x^(2)=t)` ` =(a)/(4)log(x^(4)+c^(2))+(b)/(2)(1)/(c)"tan"^(-1)(x^(2))/(c)+k` |
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