View Compilation Error

0_0_31773690_475.cpp: In function 'double d(double, double)':
0_0_31773690_475.cpp:4:22: error: 'pow' was not declared in this scope
     return 42*pow(f,6)+48*pow(f,5)+21*pow(f,2)+10*f-l;
                      ^
0_0_31773690_475.cpp: In function 'int main()':
0_0_31773690_475.cpp:29:26: error: 'pow' was not declared in this scope
             min=6*pow(x,7)+8*pow(x,6)+7*pow(x,3)+5*x*x-x*y;
                          ^