View Compilation Error

0_0_17228373_6422.cpp: In function 'int main()':
0_0_17228373_6422.cpp:28:20: error: 'pow' was not declared in this scope
         B=pow(B,m-1);
                    ^
0_0_17228373_6422.cpp:29:18: error: 'mul' was not declared in this scope
         A=mul(B,A);
                  ^