$x^2+18xy+81y^2$
$\lim\:_{x\to\:y\:}\left(\frac{4xy}{3x^2+y^2}\right)$
$19\sin x=6\cos^2x-14$
$\frac{3}{7}x^2+\frac{2}{7}x^2+\frac{1}{7}x^2$
$\frac{4x^3-2x^2+24x+11}{2x-5}$
$y=\sqrt{x^4-11x^3+24x^2}$
$\frac{dy}{dx}=x^2y^{-7}$
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