View Compilation Error

0_0_5400233_16208.cpp: In function `double F(double, double)':
0_0_5400233_16208.cpp:5: error: `pow' undeclared (first use this function)
0_0_5400233_16208.cpp:5: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_5400233_16208.cpp: In function `int main()':
0_0_5400233_16208.cpp:22: error: `pow' undeclared (first use this function)