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[DEG mode]
<Example>
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
trigonomet
ric 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?
DEG
tan
-1
(
80
÷
100
)
 
25


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