The next most common calls are to excp() and excp(). To inline these, make sure that they are in the same file with getVxc() and getDExc(). To induce the compiler to inline them, you may need to add the keyword ``inline'' to the prototypes:
inline double exc(double rs) inline double excp(double rs)
This reduced our time to 3.3 sec. From the original solution time of 26 sec at the start of this problem set, we now have nearly an order of magnitude improvement!
your final run time to show the grader and discuss during lab.