The extra 1/2 you have can be incorporated into the integration constant c.
Hi, I have been getting a different answer to the answer in my sheet, but
I could not tell my error, when I checked online, different integral calculators gave different answers.
Rearrange to 1/2[x^2 * 2x/(1+x^2)]
Let u = x^2 + 1, so dx = 1/2x, and x^2 = u -1
However the answer sheet, and most of the online calculators say the answer is:
Please can you tell me what I'm missing