$\frac{1-\sec\left(a\right)}{\tan\left(a\right)}-\frac{\tan\left(a\right)}{1-\sec\left(a\right)}$
$\left(2xy\right)^3+\left(3xy\right)^2-\left(3xy\right)^3$
$\left(5y^{a+1}-4\right)\left(5y^{a+1}-14\right)$
$24\:-\:\left(-15\right)\:+\:\left(-14\right)$
$yx^3-3yx$
$\left(\sqrt{x-2}\right)\cdot\left(\sqrt{x-10}\right)$
$-2\left(x+4\right)^3$
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