The integral of tan^(−1)(x) is - A. x tan^(−1)(x)−x ln|1+x^2|+c B. x^2 tan^(−1)(x)−1/2 ln|1+x^2|+c C. x tan^(−1)(x)−1/2 ln|1+x^2|+c D. x tan^(−1)(x)−x/2 ln|1+x^2|+c

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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