Use the theorems on derivatives to find the derivatives of the following function: f(x)=(5x^{3}+8x^{2}-4)^{4}(8x^{4}-2x^{3}-7)

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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