Algorithms for trig. on scientific calculators ?

[MinkLib]

There are three I am aware of, for pocket calculators to get sin/cos/tan and arc functions.

CORDIC (invented 1958 at Convair by Jack Volder for jet bomber digital navigation):
Used by HP from 1966 on and then in the HP35 (1972) et al.
And many other makes subsequently.

Taylor Series (invented 1671 by Newton and Gregory):
Used by Elektronika in their programmable Soviet calculators from 1978 on (B3-21, B3-34, MK-54, MK-61, MK-52 etc.) per Sergei Frolov. First five terms used, as far as my calculations show..

Minsky circle algorithm (invented at MIT by Marvin Minsky, 1972).
Used in the unique Sinclair Scientific reprogramming of a 4 function chip from TI, in 1974, using 0.001 radian steps.

Any others?