HP -65 Owner's Handbook Manual page 41

Functions
Sample Case: Adding/Subtracting DDDDD.MMSS. Find the
sum of 45° 10 50" and 44° 49' 10".
Press
=R L] 4
45.1050
[ENTER¢®,
44.4910
[
A musical selection begins at 9:25" 7" and ends at 9:39" 47".
How long is the piece?
Answer, 90° 00' 00".
Press See Displayed Comment
ER @ 0.0000
9.3947 B Completion time.
9.2507 EZTa Starting time.
B EZa Answer, 14' 40" duration.
B3 (-][2] 7R Resetdisplay to two places.
Sample Case: Trigonometric Functions. Compute cosine 60°.
Press See Displayed Comment
81 60 a
i [cos 0.50 Answer.
Compute arc cosine (—1.) expressed in radians.
Press See Displayed Comment
a lews EEE
f#t 3.14 Answerin radians.
Compute sine 30°.
Press See Displayed Comment
8 30 30|
| [sn] - Answer.