$81x^2-12x+36$
$2x^2-3\le6x+5$
$x^2-7x+2$
$2\sin\left(9x\right)\cos\left(7x\right)$
$10x-4+9+3x$
$\left(x^2+1\right)y'-xe^{2y}=0$
$\frac{5x^2+8x-2}{4x}$
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