/usr/share/gauche-0.9/0.9.4/lib/math/const.scm is in gauche 0.9.4-3.
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;;; math.const - useful constants
;;;
;;; public domain
;;;
(define-module math.const
(export pi e 1/pi 180/pi pi/2 pi/4 pi/180 2pi))
(select-module math.const)
(define-constant pi 3.141592653589793)
(define-constant 2pi 6.283185307179586)
(define-constant pi/2 1.5707963267948966)
(define-constant pi/4 0.7853981633974483)
(define-constant pi/180 0.017453292519943295)
(define-constant 1/pi 0.3183098861837907)
(define-constant 180/pi 57.29577951308232)
(define-constant e 2.718281828459045)
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