$-5\:+\:-19\:+\:-25$
$\frac{d^2}{dx^2}\left(x^2\cdot e^{3xy}+4xz^3\right)$
$\tan\left(75\right)\frac{x}{2}$
$\left(-24-\left(-36\right)\right)$
$\cos\left(x+y\right)\sin\left(y\right)-\sin\left(x+y\right)\cos\left(y\right)$
$3xy^2-3xy^2z-2xyz^2+xyz^2$
$c^8-9$
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