$81c^2-180cf+100f^2$
$x-20>60$
$5.78\cdot3$
$\frac{sen\:u}{1-cos\:u}=\frac{1+cos\:u}{sen\:u}$
$3n^2-25=83$
$\left(19x-2\right)+\left(6x+1\right)$
$x=y'\ln\left(y\right)$
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