$49\left(c+d\right)^2-9a^2$
$2b-5b+8b$
$\lim\:_{x\to\:0}\left(\frac{x^3-x^2}{cosx-1}\right)$
$16m^2-25m^2n^2+9m^4$
$cos\left(2a-30\right)$
$\frac{d}{dx}arcsin\left(\frac{b+kcosx}{k+cosx}\right)$
$\frac{dy}{dv}=y\left(y-1\right)$
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