$\left(x-1\right)^2\ge x^2+1$
$\left(2x+y\right)\left(2x-y\right)=4x\left(x-1\right)$
$-5g-\left(8-g\right)=12$
$-17mn+3mn+18mn$
$9x^2-24am^2x^2+144m^2x^2$
$3x=9x$
$cos\left(2x-60\right)$
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