$10mn^2+8n^2m+6mn-5a+6n^2-5a+mn^2-10a$
$\lim_{x\to0}\left(\frac{tanx-x}{cosx-x}\right)$
$x^2-30x+255$
$\frac{1}{ab}-a^2b^2$
$\left(y+\sqrt{y^2-x^2}\right)dx-xdy$
$\frac{d}{dx}y^2-4x^2+e^{xy}=c$
$\sin x-\frac{1}{2}=0$
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