$\frac{\cos\left(8x\right)\cos\left(2x\right)}{2}$
$a^3-6a^3-7a$
$4-10p+25p^2$
$\frac{1}{9}x^2-\frac{4}{16}$
$\:b\:4\:-b\:3\:$
$6\cdot4-1$
$\frac{\log\:_{10}216}{\log\:_{10}6}$
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