$13.5\cdot13.5$
$\frac{x^2-2x+10}{x-5}$
$\left(-5\right)-\left(-20\right)$
$-\sec^2\left(x\right)+\cos^2\left(1\right)$
$-8+9\left(\left(-6+6r\right)\right)$
$x^2-x+72$
$3\sqrt{24}-3\sqrt{3}+2\sqrt{75}$
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