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Evaluate:`int(2x+1)/(x^4+2x^3+x^2-1)dx` |
Answer» `I = int(2x+1)/(x^(4)+2x^(3)+x^(2)-1)dx` `=int(2x+1)/((x^(2)+x)^(2)-1)dx` Let `x^(2)+x=t` `:. dt=(2x+1)dx` `:. I=int(dt)/(t^(2)-1)` `=(1)/(2)log_(e)|(x^(2)+x-1)/(x^(2)+x+1)|+C` |
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