A curve has parametric equations
x = 3 cos2 t, y = sin 2t, 0 ≤ t < π.
(i) Show that
(ii) Find the coordinates of the points where the tangent to the curve is parallel to the x-axis
Ok, the first bit i did no problem, but its the second part because the gradient must be 0 correct?
meaning cot 2t = 0
However you cannot do the inverse of this because when cot t = 0...its an asymptote...
Thanks for any help