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Evaluate:Evaluate:`intx^(-11)(1+x^4)^(-1/2)dx` |
Answer» `I=int (dx)/(x^(11)(1+x^(4))^(1//2))=int (dx)/(x^(11)*x^(2)(1+1//x^(4))^(1//2))` Let `1+(1)/(x^(4))=t^(2) " or " (-4)/(x^(5))dx=2tdt` `:. I=int(dx)/(x^(13)(1+1//x^(4))^(1//2 ))` `=-(1)/(4)int(2tdt)/(x^(8)t)` `=-(1)/(2)int(t^(2)-1)^(2)dt` `=-(1)/(2)int(t^(4)-2t^(2)+1)dt` `= -(1)/(2)[(t^(5))/(5)-(2t^(3))/(3)+t]+C, " where " t=sqrt(1+(1)/(x^(4)))` |
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