$\left(1-ab\right)\cdot\left(1+ab\right)$
$x^2-6=x$
$\left(h-6\right)\left(h+6\right)=0$
$\cos\left(39.8\right)$
$\frac{x^{15}+a^{15}}{x+a}$
$\frac{6x^3+5x+7}{3x^2+2}$
$-2\left(-4x\:+\:3\right)$
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