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- pi_4(1, Pi) -> Pi;
- pi_4(K, Pi) ->
- case K rem 2 of
- 1 -> pi_4(K-1, Pi+1/(2*K-1));
- 0 -> pi_4(K-1, Pi-1/(2*K-1))
- end.
- pi(K) -> 4*pi_4(K, 1).
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