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View Compilation Error

0_0_11813578_10406.cpp: In function `double calc_angle(P_type, P_type, P_type)':
0_0_11813578_10406.cpp:89: error: `M_PI' undeclared (first use this function)
0_0_11813578_10406.cpp:89: error: (Each undeclared identifier is reported only once for each function it appears in.)


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