$49y^2-2y+1$
$\left(16m-17n\right)^2$
$10b^6-20b^5$
$\left(-x^2-2y^2\right)^5$
$x+7\ge0$
$x^2y+2x^2-y-2=0$
$sin^2x-4cos^2x=1-5cos^2x$
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