$\frac{m^2}{4+4n^4-2mn}$
$\frac{x^5+1}{x-2}$
$\cot a^2\cdot\sin a^2=\cos a^2$
$3x-4+4\frac{x}{4}<\frac{5x}{2}+2$
$x^2+20x+-100$
$\int\left(x^4sinx\right)dx$
$\frac{d}{dx}\left(x+7\right)$
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