$\frac { 12 n ^ { 3 } - 8 n } { 2 n }$
$\sec\left(1-\sin^2\left(x\right)\right)=\cos x$
$24mb\:+\:16ml\:+\:32\:mr$
$\frac{dy}{dx}=4x\cdot\left(y^2+2y\right)$
$8\left(4x-12\right)$
$-12-\left(-9\right)$
$\int x^2adx$
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