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Evaluate:`intx/(x^4+2x^2+3)dx` |
Answer» ` I=int(x)/(x^(4)+2x^(2)+3)dx` Let `x^(2)=t.` ` :. 2x dx=dt` ` :. I=(1)/(2)int(dt)/(t^(2)+2t+3)` `=(1)/(2)int(dt)/((t+1)^(2)+2)` `=(1)/(2)(1)/(sqrt(2))"tan"^(-1)(t+1)/(sqrt(2))+c` `=(1)/(2sqrt(2))"tan"^(-1)(x^(2)+1)/(sqrt(2))+c` |
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