Chapter 11: Trigonometry 213
7311ENG.DOC CH 11 Trigonometry, English Julie Hewlett Revised: 05/26/98 11:12 AM Printed: 05/19/99 9:02
AM Page 213 of 12
In Degree Angle mode, calculate tan-1(1). Check your answer.
1. Select the Degree Angle
mode.
.##b
2. Return to the Home screen,
and clear it, if desired.
-l:
3. Enter tan-1(1).
-u6
1Eb
4. Using the result, enter
tan(45).
-u5
45Eb
In Radian mode, calculate cos(p/4).
1. Select the Radian Angle
mode.
.##"b
2. Return to the Home screen,
and clear it, if desired.
-l:
3. Enter cos(p/4).
-u3
-„F4Eb
³
³
This confirms the
previous result.