$\left(5x+6\right)^2-\left(5x-6\right)^2$
$\left(2x^3-y\right)^2$
$.5x+6=x-4$
$x^2+9x+0$
$sen^{\left(2\right)}\left(x\right)+cos\left(2\:x\right)=0$
$\frac { 0 } { \frac { 0 } { 2 } }$
$-9b-11b-17b-81b-b-110b$
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