$\frac{9}{x}-\frac{5}{x}$
$3e^{6x}\frac{dy}{dx}=-\frac{36x}{y^2}$
$-1\left(-x\:-3\right)^{2\:}-2$
$\lim_{x\to0}\left(\frac{x^3\sin\left(2x\right)}{x}\right)$
$-4x^{2}-7x-4$
$2\cos^2x-3\cos x+1=0$
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