$\frac{d^{2}}{dx^{2}}\left(\frac{2}{x+3}\right)$
$\int\left(3x+5\right)cos\left(\frac{x}{4}\right)dx$
$2x^2-23x$
$4a+b-2a^2+b$
$\frac{6x^2-4^2+7x+3}{3x+1}$
$\lim_{x\to+\infty}\left(\frac{x-4}{x+2}\right)^x$
$2\left(x^2+10\right)+5x$
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