0_0_6815648_288.cpp: In function `double energy0(double, double, double, double)':
0_0_6815648_288.cpp:30: error: `M_PI' undeclared (first use this function)
0_0_6815648_288.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6815648_288.cpp: In function `double getTheta(double)':
0_0_6815648_288.cpp:42: error: `M_PI' undeclared (first use this function)
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