$-6^2+7\left(-6\right)-5$
$\lim_{x\to0}\frac{\left(1-cosx\right)sinx}{x^2}$
$\left(3x+13\right)^2=9x^2+39x+169$
$\left(2a^5-2b\right)^3$
$-178+870$
$-5.8-2.1$
$\left(-5x^2xy^72w^3\right)$
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