Suppose y=\sqrt{2x}+1, where x and y are functions of r.(a) If \frac{dx}{dt}=3, find \frac{dy}{dt} when x = 4.(b) If \frac{dy}{dt}=5, find \frac{dx}{dt} when x = 12.

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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