For a convex (concave) function f(x):[0,1]|->[0,1].f(0)=0,f(1)=1.f is continuous and increasing on [0,1]. Then (1/(N+1)) sum_(n=1)^Nf(n/N) should be decreasing (increasing) in N.

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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