0
x
y
log
ln
e
x
CLR
√x
arc
sin
cos
tan
1/x
x↔y
R↓
STO
RCL
ENTER↑
CHS
EEX
CLx
-
7
8
9
+
4
5
6
×
1
2
3
÷
0
.
π
HEWLETT-PACKARD
Example: To calculate
3 + 4
:
3 ENTER 4 +