6 The parametric equations of a curve are
$$x = 1 + 2 \sin ^ { 2 } \theta , \quad y = 4 \tan \theta$$
- Show that \(\frac { \mathrm { d } y } { \mathrm {~d} x } = \frac { 1 } { \sin \theta \cos ^ { 3 } \theta }\).
- Find the equation of the tangent to the curve at the point where \(\theta = \frac { 1 } { 4 } \pi\), giving your answer in the form \(y = m x + c\).