Viète's Formula for PI

[pinkman]

(06-23-2020 06:39 PM)Gerson W. Barbosa Wrote:  

(06-18-2020 12:51 PM)pinkman Wrote:  And the convergence speed is acceptable : for p(18) we have 10 digits.
p(18) means Σ(x,x,1,18) = 171 iterations.

For faster convergence, you might want to try this algorithm:
[...]

Yes! But... I really love to see the CAS in action, even if it reaches its limit in terms of recursivity.