$\frac{1-cos2x}{cos^2x}=\frac{2}{cot^2x}$
$\frac{8}{-1}$
$x^2-3x+2.25$
$abc-2a^2bc^3-ab^2$
$g-6+5$
$2^3\sqrt{4}-3^2$
$\lim_{x\to\infty}\left(\cos\left(2x+1\right)\right)$
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