$3a^2-2a^2+1$
$\frac{27}{4}x^2y+\frac{9}{8}xy^2$
$x^{12}-10x^6y^2+25y^4$
$\frac{d}{dx}\left(\sqrt{\frac{8x-7}{x^2-2x}}\right)$
$\frac{x^4-2x^2+1}{x^3+2}$
$-2.3\cdot10^2$
$\left(3x+2b\right)^3$
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