Real-valued sine function over the complex plane
The restricted domain is the subset of the complex plane on which the sine function has real values. This includes the x-axis and complex numbers whose real parts are an odd multiple of pi/2. The restricted domain is shown in a 2D window and the graph over the restricted domain in a 3D window. Use the 3D window's viewing tools to inspect the graphs. The red graphs are hyperbolic cosines.
Dr. John Gresham
Tarleton State University