$2x\:+1+7$

$\frac{\left(5\:-6x\right)}{3}<1-2x$

$\left(\frac{-a}{\sqrt{a^2+c^2}}\left(\sin\left(x\right)\right)\left(-\sin\left(x\right)\right)\right)$

$x^3+5x^2+6x$

$\lim_{x\to2}\left(\frac{\sin\left(\pi x\right)}{\left(x-2\right)\left(\cos\left(x\pi\right)\right)}\right)$

$x^2-9x+19$

$\int\:\frac{x^4-2x^3+x^2+2x-1}{x^2-2x+1}dx$