$\left(5m+6n\right)^2-\left(5m-6n\right)^2$
$\lim_{x\to0}\left(\frac{\tan\left(x\right)}{1+\cos\left(x\right)}\right)$
$\int\frac{10x^2-1}{\sqrt[2]{x}}dx$
$\frac{3x+4y-9y}{3}$
$34-\left(-24\right)-19$
$\frac{13}{2x}-\frac{5}{x}$
$x-2\left(2x^3-3x^2-5x+7\right)$
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