View Compilation Error

0_0_6537082_24423.cpp: In function `bool Miller_Rabbin(long long int, long long int)':
0_0_6537082_24423.cpp:56: error: `exp_mod' undeclared (first use this function)
0_0_6537082_24423.cpp:56: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6537082_24423.cpp:59: error: `Mulmod' undeclared (first use this function)