InterviewSolution
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`"If " f(x)=sqrt(x),g(x)=e^(x)-1, " and " int fog(x)dx=A fog(x)+B tan^(-1)(fog(x))+C, " then " A+B " is equal to "-.` |
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Answer» ` fog(x)=sqrt(e^(x)-1)` ` :. I=int sqrt(e^(x)-1)dx` `=int(2t^(2))/(t^(2)+1)dt, " where " sqrt(e^(x)-1)=t` `=2t-2tan^(-1)t+C` `=2sqrt(e^(x)-1)-2tan^(-1)(sqrt(e^(x)-1))+C` `=2fog(x)-2tan^(-1)(fog(x))+C` ` :. A+B=2+(-2)=0` |
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