$\left(a^2-5\right)\left(a^2-a\right)$
$147\left(3111-150\right)^2$
$10-9\cdot5+6\cdot\left(-2\right)$
$2x\:cos\:-\:4xcos$
$2^2+2^0+2^{-2}$
$\left(4mn-yn\right)^2$
$\frac{16v^7-8v^5}{2v^3}$
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