A rectangle has one side on the x-axis and two vertices on the
curve y=2/(1+x^2) Find the vertices of the rectangle with maximum
area. Enter your answer as a list of points (a, b) separated by
semicolons. The order of the list does not matter.
Find an equation of the tangent to the curve x = 2 + ln t, y =
t2 + 4 at the point (2, 5) by two methods.
(a) without eliminating the parameter
(b) by first eliminating the parameter