$m^y\cdot m$
$serie\:\frac{2}{3^{n+1}}$
$\frac{\sqrt{x+9}-3}{1}$
$-4c-2$
$2cos\:\frac{8}{7}x-\sqrt{2}=0$
$\left(3x\:+\:y^3\right)\left(3x\:-\:y^3\right)$
$\cos3a\:=4cos^3a-3\:cosa$
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