$\lim x\to0\left(\frac{1-\cos\left(x\right)}{x^2}\right)$
$4\left(-5\right)$
$\int x\sqrt{4-5x}dx$
$4^3-\left(-4\right)^4$
$\lim_{x\to2}\left(\frac{x^2-8}{x^2+x-6}\right)$
$\frac{x^3-x-1}{x+1}$
$12-15+10-45+3+10-8+20+1-19-30-510$
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