$\frac{d}{dx}z=x^2y+xy^2$
$\left(-378\right)-\:\left(-455\right)$
$-11\cdot23$
$-45-18+15-12-24$
$\frac{72x^5-36x^3+6^2}{6x^2}$
$cos\left(z\right)^2+\cot\left(z\right)^2$
$2\sqrt{48}$
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