1. The problem statement, all variables and given/known data Evaluate integral dx/sqrt(1-2x^2) 2. Relevant equations 3. The attempt at a solution My Answer: -cos^(-1)(sqrt(2)x)/sqrt(2) + c See my work in attachment Wolfram Alpha Answer: (sin^(-1)(sqrt(2) x))/sqrt(2)+constant http://www.wolframalpha.com/input/?i=integral+dx%2Fsqrt%281-2x^2%29 MATLAB Answer: Code (Text): >> syms x >> int(1/sqrt(1-2*x^2)) ans = (2^(1/2)*asin(2^(1/2)*x))/2 I know how I chose to evaluate this integral is not the traditional way of how things are done but I strongly believe that what I did is mathematically correct as you can see in my steps and so I should get the same answer but I don't, I don't know what I'm doing wrong and hope somebody can tell me... Thanks in advance!