Question

cat este integrala din X\X^2+1 dx side ce?

Answer 1

$\int\limits { \frac{x}{ x^{2} +1} \, dx= \frac{1}{2} \int\limits { \frac{2x}{ x^{2} +1} } \, dx= \frac{1}{2} \int\limits { \frac{( x^{2} +1)'}{ x^{2} +1} } \, dx= \frac{1}{2}ln( x^{2} +1)+C.$