$60x^2-70^4$
$\int\left(x\right)\frac{4x}{x^2+4}dx$
$\frac{d}{dx}\left(x^2y^3-zxy=2\right)$
$\lim_{x\to3}\left(\frac{x^2-5x+6}{3-\sqrt{3x}}\right)$
$\frac{2+2n}{3n-1}$
$n^2-5-5+10$
$e^x\cdot e^{3x}$
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