$\left(x^2-\frac{1}{9}\right)^2$
$x^2-\left(6\right)x-12$
$z^2-4$
$\left(x+02\right)^2$
$2x+2x^2-3x+2x^2$
$\left(4x^2+5\right)\left(4x^2-3\right)$
$2cosxsinx=cosx$
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