HP -65 Owner's Handbook Manual page 42

Compute arc sine (1.00) expressed in radians.
Press See Displayed Comment
B 1 7.
i (5] - Answer in radians.
Compute tangent 45°.
Press See Displayed Comment
B 45 En
=
-
Answer.
Compute arc tangent (39.4), expressed in radians.
Press See Displayed Comment
BEo3s BN
] 1.55 Answerin radians.
Sample Case: Polar to Rectangular. Convert polar coordinates
(r=38, §=120°) to rectangular coordinates:
(x,y)