Robotic Arm Movement

Robot4 (tm) is a Robotic Arm Movement program where the arm is moved from a given position to a desired position. The program finds the angles necessary for the desired position. (I think this is the idea!) Problem came from NASA. This is an example of how Automatic Differentiation will simpify problem solving.
Robot4 is an Inverse Problem example. It wants to solve how to move from starting point 'A' to target point 'B'. Solutions to Inverse Problems are easy with a Calculus-level programming language.
Robot4 was made possible do to a Calculus compiler. The source code (Rob4User.fc) file is included in order to show the Calculus programming
simplicity.