38
<Example 1>
Operation Display
θ
=
sin
-1
b
a
θ
= cos
-1
c
a
θ
= tan
-1
b
c
c
a
b
θ
100
80
Arc Trigonometric Functions
Arc trigonometric functions, the inverse of
trigonometric functions, are used to determine an
angle from ratios of a right triangle.
The combinations of the three sides are sin
-1
, cos
-1
,
and tan
-1
. Their relations are;
(arc sine) Determines an angle based on the ratio
b/a of two sides of a right triangle.
(arc cosine) Determines an angle based on the ratio
c/a for two sides of a right triangle.
(arc tangent) Determines an angle based on the
ratio b/c for two sides of a right triangle.
At what angle should an airplane climb in order
to climb 80 meters in 100 meters?
<Angle setting " " (DEG)>
(DRG)
(DEG)
NOTE:
In EL-W516T,
Use instead of .
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