$-16+n=-8$
$108-3x^2$
$\frac{3^3}{3^2}-3$
$x^2-2x-48=0$
$\cot^4x+\cot^2x$
$3x\:2y\:3x\:2y$
$\left(\sqrt{1-x^2}\right)y'=xy$
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