$3253+423+21$
$\left(f+g\right)\left(x\right)\sqrt{9-x^2}+\sqrt{x^2-4}$
$3\:=\:\frac{g\:-\:60}{7}$
$x^2-kx+25=0$
$\frac{2tg70^{\circ}+tg40^{\circ}}{ctg20^{\circ}.ctg50^{\circ}}=m$
$52.385-2.7$
$\left(\frac{x^2y}{2}+4\right)\left(\frac{x^2y}{2}-y\right)$
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