$abc-2\left(a-b+c\right)$

$-9x-6\:x\:2$

$\left(x-y\right)\left(x^2+xy+y^3\right)$

$\sin\left(x\right)-\frac{1}{4}=\frac{1}{4}$

$\lim_{x\to0}\left(\frac{x^2+110x}{5\sin\left(x\right)}\right)$

$\frac{d^3}{dx^3}\left(4x^2ln3x\right)$

$2\sin\left(z\right)+\sin\left(z\right)\tan\left(z\right)=\sin\left(z\right)$