Write a version of the programs in Exercise 2.13 that uses functions sind, cosd, and atan2d instead of functions sin, cos, and atan2. What is the difference between these two sets of programs?

Exercise 2.13

A two-dimensional vector in a Cartesian plane can be represented in either rectangular coordinates (x,y) or the polar coordinates (r,u), as shown in Figure 2.22. The relationships among these two sets of coordinates are given by the following equations: