$-3^2-4\left(-2\right)^3$
$\left(39-2x\right)^2$
$\lim_{x\to0}\frac{\sqrt[3]{1+x^2}-\sqrt[4]{1-2x}}{x^2}$
$x^2-\:\:\frac{y^2}{4}$
$\frac{\left(x^4-81\right)}{\left(x-3\right)}$
$20sin\left(14x\right)sin\left(11x\right)$
$\left(\sqrt{4x}\right)^3$
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