$\:a+8ab-2a-5ab\:$
$cos4x\:cos5x\:-\:sin4x\:sin5x$
$3-6-2+5+2+6$
$9ab^{3\:}+6ab^{3\:}-\:2ab^3$
$\frac{2}{16}x^{2}+\frac{1}{3}x+\frac{4}{9}$
$y=2\left(x^2+5x-2\right)^{\frac{-5}{7}}$
$\left(a+b\right)\left(m+n\right)$
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