$x-4\ge2-2x^2$
$\frac{d}{dx}\:x+\frac{1}{x^2}$
$6.80\cdot0.99$
$4x+2\ge10$
$\frac{dy}{dx}\left(x^2y^2+\ln\left(x^2+y^2\right)=10\right)$
$\lim_{n\to3}\left(\frac{3x^2-9x}{x-3}\right)$
$9d^2-d^2$
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