$-2x^2+4x-2\:=\:-18$

$\frac{d}{dx}x^5-x^3+3$

$27a^3b^9-27c^6$

$\lim_{x\to0}\frac{\sin\left(3x\right)\cos\left(4x\right)}{\cos\left(3x\right)\sin\left(4x\right)}$

$\int\frac{6x^2-2x-1}{x\left(2x+1\right)\left(2x-1\right)}dx$

$\int_1^7\left(x-3\right)\:e^{\left(x^2-6x\right)}\:dx$

$\lim_{x\to0}\left(\frac{x^3}{lncosx}\right)$