$36x^4y^6+6x^2y^5z+\frac{1}{4}y^4z^2$
$\left(-3\right)^2+2\left(-3\right)+1$
$4n^2-8n-12$
$7^2-9^2$
$\frac{dy}{dx}=xe^{x^2-2y}$
$x^2-x-152$
$2cosx=cosx+1$
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