$\lim_{x\to1}\left(\frac{121x^2-16}{11x-4}\right)$

$4x^2+8x+1$

$\left(x^{3}+12x^{2}-20x+7\right)+\left(x+1\right)$

$\int\left(\frac{1}{1+x^2}+x^2\right)dx$

$\int_{\frac{2}{3}}^{\frac{2}{3}}\frac{1}{x^5\sqrt{9x^2-1}}dx$

$\int\left(sen^2\:\pi\:x\:cos^4\pi\:x\right)dx$

$\frac{18s^8\:\:}{3s^4\:\:}$