$a-4^2$
$\left(2ab+b^2\right)\left(3ab-b\right)$
$-\sqrt{1}+\sqrt{-4-5}$
$\frac{3}{5\:}y\:\frac{6}{10}$
$-x^4+16$
$sin^22x=\frac{1}{2}$
$\left(b+8c\right)\left(b-8c\right)$
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