According to <http://www.microapl.co.uk/apl/APL1_2.PDF>, there are circle function between ¯12 and 12. For example, functions 1, 2, and 3 are respectively `sin`, `cos`, and `tan`. I found on [this reference](http://www.microapl.co.uk/apl_help/ch_020_020_240.htm) what are functions ¯7 to 7. However, I didn't find what are functions 8 to 12 (and their reciprocals). Could anybody point me what they are?