$x^2-y^2-z^2+4;\:x=-2;\:y=-4;\:z=3$
$2xy-5x$
$\frac{\left(n+1\right)}{\left(n+2\right)n^2}$
$16-21.9$
$\left(\sqrt{3}x+9\right)^2$
$\frac{d^2}{dx^2}\left(e^{x^2-1}\right)$
$-5+8\left(-8\right)$
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