(28/48/50) Complete Elliptic Integrals

[Thomas Klemm]

Just out of curiosity: why would you use .00000000002 instead of 2E-11?
Is this faster?

---

From Legendre's relation:

For example:

\(
K({\color {blueviolet}{\tfrac {3}{5}}})E({\color {blue}{\tfrac {4}{5}}})+E({\color {blueviolet}{\tfrac {3}{5}}})K({\color {blue}{\tfrac {4}{5}}})-K({\color {blueviolet}{\tfrac {3}{5}}})K({\color {blue}{\tfrac {4}{5}}})={\tfrac {1}{2}}\pi
\)

.6 Kk
.8 Ek
*
.6 Ek
.8 Kk
*
+
.6 Kk
.8 Kk
*
-

1.57079632679

Compare this to \(\frac{\pi}{2}\):

1.5707963268

LGTM