Arc Trigonometric Functions 
Arc trigonometric functions, the inverse of trigonomet- |
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ric functions, are used to determine an angle from ratios |
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of a right triangle.The combinations of the three sides |
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are | θ |
(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 a/b for two sides of a right triangle.
a
b
c
θ=
θ=
θ=
<Example>
At what angle should an airplane climb in order to climb 80 meters in 100 meters?
[DEG mode]
O per ation
80
100
D isplay
DEG
22
