HP 10bII+, User Manual

Page: 43 / 187

Getting Started 35
Trigonometric and Hyperbolic Functions and Modes
Selecting Angle Format
The trigonometric angle format determines how numbers are interpreted when using
trigonometry functions. The default format for angles on the 10bII+ is degrees . To change to
radians mode, press
]3
. When radians mode is active, the RAD annunciator is
displayed.
Trigonometric Functions
Example
Perform the following trigonometric calculations. If RAD is lit in the display, press
]3
.
Table 2-15 Trigonometric functions
Keys Description
]c Calculates sine, written as sin .
]R Calculates cosine, written as
cos .
]C Calculates tangent, written as
tan .
]oc Calculates inverse sine, also
written,
arcsin , asin , or sin
-1
.
]oR
Calculates inverse cosine, also
written,
arccos , acos , or cos
-1
.
]oC Calculates inverse tangent, also
written,
arctan , atan , or tan
-1
.
Table 2-16 Example using various trigonometric calculations
Keys Display Description
\5Y
0.0000 Set display to four decimal places.
JV]c
0.2588
Displays sine of 15
o
.
J1S:]C
1.7321
Displays tangent of 60
o
.
4
2.7321
Calculates 1 + tangent of 60
o
.
7DV]oR
69.5127 Displays inverse cosine of 0.35.