Mathematical functions

#include  <math.h>  to use
Sometimes need  -lm  when compiling
       g++  -Wall  -g  -o  hello  hello.cc  -lm
Functions:
sqrt(), abs(), sin(), cos(), tan(), log(), log10(), exp(), pow(), etc
Majority work with  double  variables
For more info, see the math.h section of the "C++ Library Reference"
"Useful Resources" on PP website