$6m\left(4x-2\right)-5n\left(4x-2\right)$
$25x^2+40xy+16y^2$
$\left(x+3y\right)-\left(x+3y\right)^2$
$2y^2-y+15$
$\frac{xsen\left(x\right)}{x^3}$
$x^2+2x+4>0$
$\int 10 s e ^ { s } d s$
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