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Evaluate: `int1/((x-3)sqrt(x+1)) dx` |
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Answer» Let `I=int(1)/((x-3)sqrt(x+1))dx` `" Let " x+1=t^(2) " or " dx=2t dt` `:. I=int(1)/((t^(2)-1-3))(2t)/(sqrt(t^(2)))dt` `=2int(dt)/(t^(2)-2^(2))=2xx(1)/(2(2))log|(t-2)/(t+2)|+C` `=(1)/(2)log|(sqrt(x+1)-2)/(sqrt(x+1)+2)|+C` |
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