$\cos\left(o+\frac{\pi}{4}\right)$
$\lim_{x\to2}\left(\frac{2x^2+x-6}{x-6}\right)$
$\int\sqrt[3]{\cdot7}$
$2x-3y-5z=-19$
$\frac{1-2sin^2x+sin^4x}{cos^2x}$
$\frac{x^2-4x+4}{x+1}$
$\frac{1x}{2}$
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