Homework Help: Calculus 2

Posted by Heather on Wednesday, October 10, 2012 at 6:54pm.

Evalute the integral of x/(x^2+4)dx using u-substitution and then trigonometric substitution. I did this and got (1/2)ln(x^2+4)+C using u-substitution and x^2+4+C using trigonometric substitution. What did I do wrong??? thank you for helping!

Calculus 2 - Reiny, Wednesday, October 10, 2012 at 8:10pm
The answer is clearly
(1/2) ln(x^2 + 4) + C

you can check by taking the derivative

I don't know how you got the other answer, but it is definitely incorrect

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