$-19\:x\:-19$
$25y-17y-6xy-3xy$
$\left(\frac{x+y}{2}\right)^2-\left(\frac{x-y}{2}\right)^2=xy$
$\frac{63a^2}{7a^5b}$
$\frac{2}{\cos^2\left(x\right)}\:-\:2\tan^2\left(x\right)$
$100-4\left(-1\right)$
$400x^2-1$
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