$57\:+\:-14\:+\:15\:+\:-6\:+\:-15\:\:$

$\cos\left(x\right)\left(\cos\left(x\right)+\tan^2\left(x\right)\cos\left(x\right)\right)$

$2x^2-12x+18$

$16+2\cdot36$

$\left(4z^2\right)^3$

$\left(a^2c^3\right)\left(-3b^2c\right)\left(-5a^2b\right)$

$\lim_{x\to\infty}\left(\frac{2x^2+5x+4}{x^2+4x-4}\right)$