$\cos^2x-\sec^2x$
$4\cdot y-8\cdot z+16^2$
$50\cdot62$
$+7+4+3$
$\left(4a+6x\right)^2$
$\frac{62x-149}{x^2+7x-30}$
$\lim_{x\to2}\left(\left(x+1\right)^2\right)$
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