Question

Solve the integral:
4x / (x^2 + 1)
Show steps.

Answer 1

\[u=x^{2}+1 .......du=2xdx......\]

Answer 2

\[\int\limits_{}^{}2\frac{du}{u}\]

Answer 3

=2 lnu +C substitute u back in and its finished

Answer 4

\[=2\ln(x^{2}+1) +C\]