1 #include <math.h> 2 3 void diffVt(double vec1[3],double vec2[3], double ans[3]); 4 void crossProd(double a[3], double b[3], double ans[3]); 5 double dotProd(double a[3], double b[3]); 6 double vecMag(double a[3]); 7 int vecEqual(double a[3], double b[3]); 8 9 10 11