$\left(x-2\right)^2>\:0$
$36\:x^2-\:\left(3y\:+\:1\:\right)^2$
$x\sqrt[2]{x+2x}$
$9x^4+13x^2-23x+49;\:x=-5$
$x^4+4x^2-5$
$z^3\:x\:\left(x^2\right)^3$
$4+4b$
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