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PI_4
std
math
constants
π / 4 = 0.785398...
enum
real
PI_4
;
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std
math
constants
variables
E
LN10
LN2
LOG10E
LOG2
LOG2E
LOG2T
M_1_PI
M_2_PI
M_2_SQRTPI
PI
PI_2
PI_4
SQRT1_2
SQRT2
π / 4 = 0.785398...