$\left(x^2+\sqrt{2}\right)^2-2\sqrt{2}x-x^2$
$c^{15}-c^{12}+2c^9-3c^6$
$4m^4-2m^{-3}$
$a+b=12$
$55=\frac{t^2-t}{2}$
$\left(3ab2c\:-\:4ad2\right)\:\left(3ab2c\:+\:4ad2\right)\:$
$-160\cdot\left(-21\cdot\:1668\right)$
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