$-2a-\frac{1}{3}a+2a$
$\frac{d}{dx}\frac{e^{-2x}}{x^2}$
$cot\left(2x\right)=1.376$
$\int\frac{\sqrt{5+2tan}}{cos^2}dx$
$\left(3x-3\right)\left(-3x+3\right)$
$\int\left(\frac{8x}{5+4x^2}\right)dx$
$\lim_{n\to\infty}\left(\frac{3^{n-1}}{3^{n-1}+1}\right)$
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