$\lim_{x\to0}\left(\frac{x^4-80}{x-4}\right)$
$x^4+3x^3+x^2-3x-2$
$45m^2-56m-45$
$\left(sinx\right)\left(cosx\right)\left(cotx\right)-sin^2x=1$
$\left(-8\right)^3\cdot\left(-8\right)\cdot\left(-8\right)^0$
$49x^2y^2-64w^2z^2$
$5-\left(-16\right)$
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