a) Calc sin(10°) with hypergeometric Function:

b) Calc sin(10°) with Iteration :

Benchmark 333 Mio. digits:
Software   |  Algor.   |  Time
-----------+-----------+---------
YMP        |Householder|   8 s
y-cruncher |Householder|  20 s (because functions and variable number of digits are missing)
Mathematica|Root[]:    | 191 s
y-cruncher |2F1(..)    | 454 s
Mathematica|Sin[10 Deg]|4025 s

Benchmark 10^9 digits:
Software   |  Algor.   |  Time
-----------+-----------+---------
YMP        |Householder|  30 s
y-cruncher |Householder|  68 s (because functions and variable number of digits are missing)
y-cruncher |2F1(..)    |1716 s