$2x^2+10x=0$
$\cos8^{\circ}\cdot\cos22^{\circ}-\sen8^{\circ}\cdot\sen22^{\circ}$
$25x^3+30x^2-x$
$-54b^3c+46b^3c$
$ab-3bc-2a+bc$
$\lim_{x\to5}\left(\sqrt[4]{9-x^2}\right)$
$-\frac{10}{3}x^3+\frac{116,67}{2}x^2+40x-1613.969$
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