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Evaluate:`int(dx)/(x^2(x^4+1)^(3/4))` |
Answer» `I=int(dx)/(x^(2)(x^(4)+1)^((3)/(4)))=int(dx)/(x^(2).x^(3)(1+(1)/(x^(4)))^((3)/(4)))` `=int((1+(1)/(x^(4)))^(-(3)/(4))dx)/(x^(5))` Let `1+(1)/(x^(4))=t " or " (-4)/(x^(5))dx=dt` ` :. I= -(1)/(4)int t^(-(3)/(4))dt= -(1)/(4)(t^((1)/(4)))/((1)/(4))+C` `= -(1+(1)/(x^(4)))^((1)/(4))+C` |
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