1. Find the derivative of the curve given by the equation: \( 2 ( x - y ) = 3 + \sin y \)
2. There is a point on the curve from #1 between \( - \frac { \pi } { 2 } < y \leq \frac { \pi } { 2 } \) at which the line tangent to the curve has as a slope of 1. Find the coordinates of that point.