$\left(5x^2-\:6y^3\right)\left(5x^2-\:6y^3\right)$
$4m^2\:-+\:12m\:-15$
$7x+29=11x-31$
$sen\:x\:.\:cotg\:x\:.\:sec\:x\:=cos\:x\:.\:sec\:x$
$x^2-3x=8$
$\frac{6e^{2}-3e}{4e^{2}-1}$
$\left(7a^3-5\right)^2$
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