$x^2+y^2-\left(x^2+2xy+y^2\right)+\left|-x^2+y^3\right|$
$\sin\left(2x\right)+sin\left(x\right)=sin\left(x\right)$
$\frac{8x^9+y^6}{2x^3+y^2}$
$\lim_{x\to0}\left(\frac{4^{6x}-1}{x}\right)$
$7a^2-7b^2$
$0.1x+0.7<2x-1.2$
$\frac{d^2}{dx^2}=x^2e^{xy}$
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