Evaluate the integral \int \arctan(x)dx A)-\arctan(x)+\ln(x^2+1)+C B)\frac{1}{x^2+1}+C C)x \arctan(x)-\frac{1}{2}\ln(x^2+1)+C D) \ln|\arccos(x)|+C E) x\arctan(x)+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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