$\cos\left(2y\right)+1$
$\left(4x+3y-5\right)\left(4x+3y+5\right)$
$x+x^3-x$
$-\left(2-2^3\right)^2+5\cdot\left(-2\right)$
$\sqrt{3x+1}x=0$
$-3\left(2x-1\right)^2$
$18yz\:^5\:+\:16z^7\:-\:24yz^6\:+22yz^4$
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