$x^2+y^2+z^2;\:x=4;\:y=8;z=-3$
$\frac{dy}{dx}=-\frac{x}{y\cdot e^{x^2}}$
$\frac{x^3+28x-48}{x+4}$
$x+x^2-x^3$
$9.32-0.7$
$5\tan x-6=2$
$5\left(1-\cos^2\left(\frac{x}{2}\right)\right)^4$
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