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CHAPTER 1
Find all angles between ° 0 and
Example 14
cos =
OPERATION
1 . First make sure your calculator is in COMP/Deg mode.
MODE
MODE
1
1 −
2 . Now, evaluate
cos
-1
cos
SHIFT
cos
0
3 . Press
once and thus obtaining the basic angle
˚'"
α as approximately
67 °
4 . To determine the second angle, which lies in the fourth quadrant, press
3
6
0
˚'"
`
Therefore the solutions are
Using similar operations as in Example 14, find all angles between
cos =
x
satisfy the equation
Let's Get Started
x
. 0
38
.
MODE
1
to determine α , the basic angle.
. 0
38
•
3
8
40
'
.
=
–
Ans
67°
40
'
and
292°
20
. 0
53
.
°
360 inclusive which satisfy the equation
-1
cos
=
-1
cos
360-Ans
360-Ans
'
, approximately.
° 0
360
and
D
0
0.38
67.66631734
0.38
–
–
67
39
58.74
292.3336827
–
–
292
20
1.26
°
inclusive which
8
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