360 degrees = 2ir radians = 400 grads
To set an angular mode, press Bl modesI. Then select an option.
Option
Description
Annunciator
{DG}
{RD}
{GR}
Sets
Degrees mode (DEG).
Uses
decimal frac
tions,
not
minutes
and
seconds.
Sets
Radians
mode
(RAD).
Sets
Grads
mode
(GRAD).
none
RAD
GRAD
Trigonometric
Functions
With x in the display:
4
Note
To
Calculate:
Press:
Sine
of
x.
Cosine
of
x.
Tangent of x.
Arc
sine
of
x.
Arc
cosine
of
x.
Arc
tangent
of x.
| SIN |
|COS|
|TAN|
KilASINl
W\ ACQS|
KilATANl
Calculations
with
the
irrational
number
ir
cannot
be
ex
pressed
exactly
withthe
12-digit
internal
precision
of the
calculator. This is particularly noticeable in trigonom
etry; for example, the calculated sin ir is not zero but
—
2.0676
x 10-13, a very small number
close
to zero.
4:
Real-Number
Functions
57
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