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Trigonometric Modes
When the HP-25 is first turned ON, it "'wakes up'' with angles
specified in decimal degrees. To set radians or grads mode,
press the ] shift key followed by either [rap](radians) or
(grads). To switch back to the decimal degrees mode again,
press the [Elshift key followed by the [bEc](degrees) key.
Note: 360 degrees = 27 radians = 400 grads
Functions
The six trigonometric functions provided by the calculator are:
[sin] (sine)
B8
(arc sine)
B
(cosine)
B
(arc cosine)
B
(tangent)
3 [tan'] (arc tangent)
Each trigonometric function assumes angles in decimal degrees,
radians, or grads. Trigonometric functions are one-number
functions, so to use them you key in the number, then press the
function keys.
Example 1: Find the cosine of 35°.
Press
Display
35
B
Calculator "'wakes up'" in
decimal degrees mode.
The answer.
Example 2: Find the arc sine in grads of .964.
Press
Display
964
9]
0.96
Grads mode is set.
e
82.87
Grads.
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