$\left(2-\sqrt{x+3}\right)^2$
$7\:-23\:+15\:-35$
$6cos^2\left(3x\right)-cos\left(3x\right)-2$
$\lim_{x\to2.1}\left(\frac{x^2-5x+6}{x-2}\right)$
$x^2\cdot5x$
$\frac{-4x^3+10x^2\:-5x\:+\:2}{x-2}$
$\left(4ab^2\right)\cdot\left(7ac\right)$
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