$\left(x-3\right)^2-\left(x-1\right)^2-4x$
$11^{-10}\cdot11^{10}$
$\frac{x^2-3x-7}{x-5}$
$\lim_{x\to0}\left(\frac{x-\cos2x}{x-\sin4x}\right)$
$4y\:+3\left(y-2\right)<\:7y$
$\frac{\left(\left(2+h\right)^2-5\left(2+h\right)-6\right)}{h}$
$\frac{\pi}{6}x^2-\frac{3\pi}{2}$
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