$\left(1+\sqrt{1-x^2}\right)^2$
$9a-5b+2\:10-4b+8$
$7y-8^3$
$x^2y+xy$
$y^2\:-\:121\:$
$\left(3x+2\right)\left(4x-2\right)$
$\left(3x+6\right)\left(3x+4\right)$
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