4.
\includegraphics[max width=\textwidth, alt={}]{23bd8979-9ba6-4e77-a3d1-88feb5e5a5b3-1_444_728_1425_536}
The diagram shows the curve with parametric equations
$$x = t + \sin t , \quad y = \sin t , \quad 0 \leq t \leq \pi$$
- Find \(\frac { \mathrm { d } y } { \mathrm {~d} x }\) in terms of \(t\).
- Find, in exact form, the coordinates of the point where the tangent to the curve is parallel to the \(x\)-axis.