$\left(5+z^2\right)\left(5-z^2\right)$
$13-0.75\left(12\right)+8\left(\frac{1}{2}\right)$
$\lim_{x\to7}\left(x^2-49\right)$
$x^2-4x-12<0$
$\frac{dx}{dy}+\frac{1}{2}y=\frac{3}{2}$
$2x^3y^5-x^8+9xy$
$( x ^ { 2 } - y ^ { 2 } ) ^ { 5 }$
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