$\int\frac{s}{\left(s-2\right)\left(s-3\right)\left(s-6\right)}ds$

$\lim_{x\to0}\left(\left(\frac{1}{\tan\left(x\right)}\right)-\frac{1}{x}\right)$

$4y^2-6y^2$

$-3r+5r$

$\left(2^0\right)\left(2^6\right)\left(2^{-3}\right)$

$\frac{d}{dx}ax^2+x+5$

$\frac{x^2-6x+7}{\left(x^3-6x^2+11x-6\right)}$