View Compilation Error

0_0_4342323_975.cpp: In function `double caluFather(double, double)':
0_0_4342323_975.cpp:23: error: `pow' undeclared (first use this function)
0_0_4342323_975.cpp:23: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4342323_975.cpp: In function `double calcufNoeY(double)':
0_0_4342323_975.cpp:26: error: `pow' undeclared (first use this function)