The radius of a sphere increases at a rate of 4m/\sec. Find the rate at which the surface area increases when the radius is 9m. 288\pi m^{2}/\sec 36\pi m^{2}/\sec 18\pi m^{2}/\sec 72\pi m^{2}/\sec 144\pi m^{2}/\sec

Find the local maximum and minimum values and saddle points of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function
$f(x,y)=x^3-6xy+8y^3$

$\frac{1}{\sec <!--\; \; -->(x)}$ in derivative?

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