Derivative of tan(x)

Move the point A along the graph of tan(x), do this slowly and watch the trace draw the derivative function. Click the tick box and discover what the derivative of tan(x) is.

Q1. How is the graph of the derivative being drawn? (Has it something to do with the slope of the tangent function?) Q2. What is the derivative of [math]f(x)=tan(x)[/math]?