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Answer on Calculus Question for Rich

Question #3983
Integrate ex/( √(ex+1))dx & & & from 0 to ln3
Expert's answer

substitution& sqrt(e^x+1)=t& =>& e^x=t^2-1& =>& x=ln(t^2-1)& =>& dx=2tdt/(t^2-1)
limits for new variable: x=0 => t=sqrt(2)
x=ln3 => t=2
so we have
Using Newton-Leibniz formula for limits sqrt(2),2 we obtain
2(2-sqrt(2))=4-2sqrt(2) and that's it

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