$\left(-4\right)\left(3x-5\right)$

$\frac{1}{\cos\left(x\right)}\left(1-sen^2x\right)$

$2x^2\left(1+y\right)$

$\lim_{x\to\infty}\left(\frac{x}{a^x}\right)$

$\lim_{x\to\infty}\left(\frac{2x+3}{2x+1}\right)^{x+1}$

$6^3.\:3^2$

$x^3\cdot tan^{-1}\left(x^3\right)\:at\:0\:$