$\frac{x}{9}=\frac{10}{x}$

$\left(-37\right)\cdot\left(-32\right)$

$2\left(3x+11\right)=6x+4$

$\int_{-\frac{\pi}{3}}^{-\frac{\pi}{4}}\left(4\sec^2\left(x\right)+\frac{\pi}{x^2}\right)dx$

$\left(-8\right)\cdot\left(-8\right)\cdot8$

$\frac{4\cdot y^7}{3\cdot y^1}$

$\lim_{x\to0}\left(\frac{tan\:4x\:-\:sen\:3x}{4x\:-\:tan\:5x}\right)$