12 The parametric equations of a curve are given by \(x = 2 \cos \theta\) and \(y = 3 \sin \theta\) for \(0 \leq \theta < 2 \pi\).
- Find \(\frac { \mathrm { d } y } { \mathrm {~d} x }\) in terms of \(\theta\).
The tangents to the curve at the points P and Q pass through the point \(( 2,6 )\).
- Show that the values of \(\theta\) at the points P and Q satisfy the equation \(2 \sin \theta + \cos \theta = 1\).
- Find the values of \(\theta\) at the points \(P\) and \(Q\).