$\frac{3x^2y^3+5a^2x^4}{3x^2}$
$2y+1+y$
$2.2\sqrt[3]{12}$
$2\:.\:-1\:.-3\:.\:4\:.\:-2$
$\lim_{x\to-1}\:-2x+1$
$4a^2-\left(x-3\right)^2$
$7x^2-42x+63$
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