Copied What is \[ \int _{-\infty }^{\infty }\frac {(\cos x)^2}{x^2+5}\,dx? \] Raw LaTeX What is \[ \int_{-\infty}^{\infty}\frac{(\cos x)^2}{x^2+5}\,dx? \] Topic Tags Complex Integration and Real Integral Evaluation Lebesgue Integration