$a^2+a^2-2a^2$
$\frac{d}{dx}\frac{-5x^4+y}{3y^2-x}$
$\left(3x^4+6z^3\right)^2$
$\frac{-2x}{x^2-49}+\frac{10}{x-7}=\frac{1}{x+7}$
$-4+\left(-6\right)\cdot\left(5-13\right)$
$25abc-33abc$
$\lim_{t\to\infty}2arctan\left(e^t\right)$
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