$e^2+4+4$
$\frac{5^2-2^2}{5+-2}$
$\lim_{x\to0}\cos\left(3x\right)^{\frac{1}{x}}$
$\frac{d}{dx}\frac{2x^2}{3x+1}$
$\int\frac{x^7}{\left(7-3x^4\right)^4}dx$
$\left(-2x^4\right)\cdot3x^2$
$\int\:\left(\frac{x^2}{\sqrt{21+4x-x^2}}\right)dx$
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