$\left(32.46-18.213\right)\cdot21.5$

$\lim_{x\to0}\left(\frac{3ln\left(tan\left(x\right)\right)}{ln\left(sin\left(x\right)\right)}\right)$

$\frac{4x^2+12x+5}{x-1}$

$\left(x^{2m}\right)^2$

$\left(x^2-2x+3\right)\left(x^2-2x-5\right)-\left(x^2-2x+5\right)\left(x^2-2x-7\right)$

$\left(4r^2-3r+2\right)-\left(-r^2-3r\right)$

$\int xc^{2x}dx$