210 Chapter 11: Trigonometry
7311ENG.DOC CH 11 Trigonometry, English Julie Hewlett Revised: 05/26/98 11:12 AM Printed: 05/19/99 9:02
AM Page 210 of 12
The -
u
TRIG Menu
The - u TRIG (trigonometry) menu accesses the
trigonometric (trig) functions (sin(, cos(, tan() and their inverses
(sin-1(, cos-1(, tan-1().
-u
The sine, cosine, and tangent of an angle (q) are defined by the
lengths of the sides of a right triangle.
sin q = opposite
hypotenuse
cos q = adjacent
hypotenuse
tan q = opposite
adjacent

Trig Functions Trig Functions -

u

1, 3, and 5 1, 3, and 5

All trig functions return the sine, cosine, or tangent of a real
number, expression, or a each element in a list. If value is a
list, the calculator calculates the trig function of each element
in the list, and a list is returned.
sin(value)
cos(value)
tan(value)
For tan, value cannot be 90, 270, etc., or M90, M270, etc. In other
words, since tan q=sinàcos by definition, tan q is undefined
when cos q=0.
adjacent
opposite
q
hypotenuse