Copied Evaluate the integral \[ \int _0^\infty \frac {x^2+1}{x^4+1}\,dx. \] Raw LaTeX Evaluate the integral \[ \int_0^\infty \frac{x^2+1}{x^4+1}\,dx. \] Topic Tags Cauchy Integral Theory and Morera's Theorem Complex Integration and Real Integral Evaluation Lebesgue Integration