$14-\frac{24}{3+\frac{6}{2}}$
$\left(2m-n\right)^2$
$2cos^2x\:+\:5sinx\:+\:1\:=\:0$
$( 3 x - 4 ) ( x + 8 )$
$x\left(2x-9\right)$
$3xy-6y$
$\frac{sen^3z+cos^3z}{sen\:z+cos\:z}=1-sen\:z\:cos\:z$
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