$4xy\:+\:5x^3\:y\:-\:2y^4;\:\:\:si:\:x=1\:;\:y\:=\:-2$
$\left(20m-n\right)\left(20m+n\right)$
$\int e^{4x}cos4x\:dx$
$\left(-48\right)\left(-6\right)$
$\frac{1-cos2a}{cos^2a}$
$\left(3x^5y^2c\right)\left(15x^3y^9c^3\right)$
$\left(a+\frac{3}{5}\right)\left(a-\frac{3}{5}\right)$
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