HP -27S Owner's Manual page 52

Figure 2-1. Numeric Function llenus
50
srNH
lrnruH
lncosH
X
CX,Y
N!
COSH ASNH
ATNH
-Q-
SOLVE
-
---
\
STAT
\ TVM
TIME
tI
E
E
tr
tt
>
DEG
>
RAD
XCORD
YCORD
2=
Keyboard Arithmetic and Numeric Functions