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PI constants

Header File 

math.h 

Description 

Common constants of pi

Name 
Meaning  
M_PI  
pi 
M_PI_2  
One-half pi 
M_PI_4  
One-fourth pi 
M_1_PI  
One divided by pi 
M_2_PI  
Two divided by pi 
M_1_SQRTPI  
One divided by the square root of pi  
M_2_SQRTPI  
Two divided by the square root of pi 
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