$\frac{2x^4-3x^3-15x^2-10x+6}{x+3}$

$\cos\left(x-\frac{\pi}{6}\right)-\cos\left(x+\frac{\pi}{6}\right)$

$\left(y-9\right)\left(y+5\right)$

$2-3\cdot\left(2-1\right)$

$\int x\frac{1}{\sqrt{x}}dx$

$\lim_{x\to\frac{\pi}{4}}\left(7\left(tan\left(x\right)\right)^{tan\left(2x\right)}\right)$

$m^3-m^2-4m+4$