User's Manual

BrailleNote Apex BT User Guide
8-221
8.6.1 Trigonometric Functions.
The trigonometric functions can be calculated in either degrees or radians. To select degrees press
T, then D, to select radians press T, then R. A setting stays in effect until it is superseded by
another.
A two-character sequence is used to select a trig function. Sine, cos and tan are preceded by T, and
the inverse functions are preceded by SPACE with T. In both cases a menu is displayed.
For sine: press T, then S.
For cosine: press T, then C.
For tangent: press T, then T.
For arc sine: press SPACE with T, then S.
For arc cosine: press SPACE with T, then C.
For arc tangent: press SPACE with T, then T.
For PI: press Y.
For example, to calculate the sine of 30 degrees, type
T S 3 0
followed by ENTER. The result "0.5" is displayed.
(Note: The result is calculated in either radians or degrees, depending on your current selection.)
Note that the function applies only to the number immediately following. If you wanted to find the
sine of the sum of two 15 degree angles, for example, you must put brackets around the addition as
follows:
T S ( 1 5 + 1 5 ) ENTER.
The result "0.5" is displayed.
To calculate the Arc Tangent of 2, type:
SPACE with T T 2
followed by ENTER. The result "63.43495" is displayed.
To calculate the cosine of PI radians divided by 3, type:
T, then R T C ( Y / 3 )
followed by ENTER. The result "0.5" is displayed.