Texas Instruments TI-73 Explorer - Chapter 11: Trigonometry; The - U TRIG Menu; Trig Functions - U 1, 3, and 5

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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