$1+x+3xy+3y\:$
$\left(4ab^2-3c^3\right)^3$
$cos\left(a-b\right)^2+sin\left(a-b\right)^2$
$-x^3+6x^2-11x+6$
$\frac{d^{21}}{dx^{21}}\left(\frac{\pi}{2}\right)$
$\sqrt[3]{2.7}$
$4x^2-\frac{25}{2x-5}$
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