$\left(x+8y\right)\left(x-4y\right)$
$x^2+2xy-x^2$
$\left(8a^2-5\right)^2$
$12-3x>18x+5$
$\frac{d}{dx}x\sqrt{x^2-16}$
$s^2-4s+16$
$\csc\left(a\right)+2=0$
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