$\lim_{x\to a}\left(\frac{\sqrt[3]{x}-\sqrt[3]{9}}{x^2-a^2}\right)$
$4\left(z+5\right)+8z$
$\lim_{x\to0}\left(-\frac{2m}{x^3}\right)$
$\left(2r\:-\:3\right)\left(r\:+\:3\right)$
$\left(r^2-2\cdot r\cdot x\cdot cos\left(\theta\right)+x^2\right)^{0.5}$
$c^2-18c+72$
$-110+25-\left(-12\right)+13-10$
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