i need your help to find the primitive for this dériver
(2x^2-1)/sqrt(x^2+1)
(2x^2-1)/sqrt(x^2+1)
\(\displaystyle\int\frac{2x^2-1}{\sqrt{x^2+1}}\;dx\\\)
Taken from Wolfram Alpha
https://www.wolframalpha.com/input/?i=int+%28%282x%5E2-1%29%2Fsqrt%28x%5E2%2B1%29%29