$-6\cdot13+\left(-8\right)\cdot\left(-9\right)$
$\lim_{x\to0}\left(\frac{\left(\sqrt{4-x^2}\right)-2}{x}\right)$
$\left(a-12x^2a^2\right)$
$\int-11\cdot dx$
$1\:-2\:-26\:27\:-90$
$4\left(4y-1\right)^{2}$
$\sqrt{4x}$
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