$\frac{4}{9}m^2-25n^2$
$\left(5a\:+\:3z\right)\:\left(5a\:-\:3z\right)$
$xy'-2y=x^3$
$\frac{1-sen^2x}{sec^2x}\:=\:cos^2x$
$\left(m-m\right)\left(m+n\right)$
$ln\left|y\right|+c=-\frac{1}{2}\ln\:\left|x^2-9\right|+c$
$-3\left(\frac{1}{2}x^3y^2\right)$
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