$\frac{dy}{dx}=\frac{\left(y^2+y\right)}{x^2}$
$\frac{x^3y^2\:.\:4yx^4}{2yx}$
$-4-x=-13$
$\cot\frac{x}{2}=1$
$\frac{12^{10}\cdot18^{5}\cdot16^{-1}}{8^{5}\cdot54^{6}}$
$\frac{\sqrt{x-3}}{-x^2-9}$
$3.4157\:\cdot\:1.20$
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