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Function
Keys
59
Trigonometric Functions
Your HP-25
provides
you with six
trigonometric
functions
.
It
also calculates angles in
decimal degrees,
radians, or grads;
and
it converts
between decimal degrees
and
degrees
,
minutes,
seconds
.
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
III
shift
key
followed
by
either
~
(radial1s)
or
~
(grads).
To
switch
back to the decimal degrees mode
again,
press
the
IlI
shift
key
followed
by
the
~
(deg
rees)
key.
Note:
360
degrees
=
27T radians
=
400 grads
Functions
The
six
trigonometric
functions
provided by
the calculator are:
D
~
(sine)
III
~
(arc sine)
D
~
(cosine)
III
~
(arc
cosine)
D
~
(tangent)
1lI
~
(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
!35.
Calculator
"wakes up
"
in
decimal degrees mode
.
D
~
!
0.82
The
a
nswer.
Example 2:
Find
the
arc sine in
grads
of
.964.
Press
.964
1lI
~
1lI
~
Display
!
0.964
!
0.96
!82.87
Grads
mode is
set.
Grads.
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