$\lim\:_{x\to\:0}\left(\frac{x^2+x}{\:x-1}\right)$

$\ln\left(x\right)\left(x^2-2x+3\right)-\int\left(\frac{x^3}{3}-x^2+3x\right)\frac{1}{x}dx$

$\left(5c^2s\right)^2$

$\left(\frac{6a^{-3}b^8}{17a^3b^{-7}}\right)^0$

$36x^2y^2-9$

$\left(4a^2b\:-\:3a\right)\left(4a^2b\:+\:9a\right)$

$2x^2-24$