$\left(-3x+1\right)\left(x-9\right)$
$\frac{3^n}{\left(-3\right)^{n+1}}$
$\frac{x+4}{x-2}\ge\:-4$
$-3x\le12$
$y^'=3y-4y^2$
$sen^23a=\frac{1}{4}$
$\frac{d}{dx}\sqrt{\frac{x-4}{x^8+3}}$
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