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laszlokorte/gist:4011883

Created November 4, 2012 13:22
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gistfile1.rkt
#lang racket
(define (anfangskurs A B D)
(define alpha (my-acos (/ (- (sin B) (* (cos D) (sin A))) (* (cos A) (sin D)))))
(cond
[(< 180 alpha) (- 360 alpha) alpha]))
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