$4^2+12x+32$
$\left(4xy-3z\right)^2$
$\frac{1-\tan^2}{\sec^2-2\tan}$
$6a+4a+5a^2$
$x^2-1\left(\frac{dy}{dx}\right)_{-xy}$
$225p^{4}-49a^{4}y^{6}z^{4}$
$6x^2-29x-28$
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