$\frac{dy}{dx}\left(y=\left(\frac{x+3}{xcosx}\right)\right)$

$\lim_{x\to0}\left(\frac{-sen\left(6x\right)-sen\left(x\right)}{x^3}\right)$

$\int\sin^2.2xdx$

$\log\left(2x-2\right)=\log\left(x\right)+\log\left(x-1\right)$

$8+3\cdot5^2-7^2$

$\int_{-\infty}^0\left(ze^z\right)dz$

$6^{x-1}=1296$