public static Vec2D fromRadians2(double angleInRad,double magnitude){
  double x=magnitude * Math.sin(angleInRad);
  double y=magnitude * Math.cos(angleInRad);
  return new Vec2D(x,y);
}

public static Vec2D fromRadians2 ( double angleInRad , double magnitude ) { double x = magnitude * Math . sin ( angleInRad ) ; double y = magnitude * Math . cos ( angleInRad ) ; return new Vec2D ( x , y ) ; }
create a 2d vector from an angle relative to the positive y - axis and a magnitude
