/ Published in: Scheme
Referencing the Machin-like formula in the linked reddit comment. Should be as exact as Scheme allows.
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(+ (- (+ (* 176 (atan (/ 1 57))) (* 28 (atan (/ 1 239)))) (* 48 (atan (/ 1 682)))) (* 96 (atan (/ 1 12943))))
URL: http://www.reddit.com/r/math/comments/f9ije/if_pi_is_the_ratio_of_a_circles_circumference_to/c1ebrc7