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Integrate the curve `(x)/(1+x^(4))` |
Answer» Correct Answer - `(1)/(2)"tan"^(-1)(x^(2))+c` Let `I=int (xdx)/(1+x^(4))=(1)/(2)int(2x)/(1+(x^(2))^(2))dx` Put `x^(2)=u rArr 2 xdx = du` `therefore" "I=(1)/(2) int(du)/(1+u^(2))=-(1)/(2)tan^(-1)(u)+x=(1)/(2)tan^(-1)(x^(2))+c` |
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