- Oct 11, 2001
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I need to solve an indefinite integral x / (1 + x^4) for homework but I keep getting 1/2 arctan(x^2) as my answer even though I know the correct answer is -1/2 arctan (1/x^2). I have to use substitution, and the way I'm approaching this problem is by setting u = x^2. This way, I'm cancelling out the x in the numerator and setting x^4 in the denominator to u^2. I dunno what I'm doing wrong, anyone care to give me a hand? Thanks a lot in advance.