If f(x)={(7-4x,x<1),(x^2+2,x >= 1):} then value of lim_(x -> )−6 f(x) is A)14 B)31 C)it does not exist D)18

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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