$\lim_{x\to0}\left(\frac{2e^x-4cos\left(x\right)+2e^{-x}}{\left(x\right)sen\left(x\right)}\right)$

$\lim_{y\to0}\left(\frac{3^y+5y-1}{2y}\right)$

$7r=-63$

$\int_{27}^{\infty}\left(\frac{1}{\sqrt[3]{x}}\right)dx$

$216m^3-27n^3$

$\frac{x^2-2x-3}{x-3}$

$\int\left(x\left(3x\:+\:5\right)^7\right)dx$