$a^{\left(2\:\right)}-4a+2$
$\left(-10\right)^3$
$\left(-1\right)^2-1$
$\cos\left(x\right)-\cos\left(\frac{1}{2}x\right)$
$10^2+11x+3$
$\left(x-6y\right)\left(7x-y\right)$
$-4-\left(-4+5\right)-\left(8-9\right)+1+6$
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