33
[DEG mode]
<Example 1>
Operation Display
sin
θ
=
b
a
tan
θ
=
b
c
cos
θ
=
c
a
a
c
b
θ
Trigonometric functions determine the ratio of three sides
of a right triangle. The combinations of the three sides are
sin, cos, and tan. Their relations are:
Calculates the sine of an angle.
Calculates the cosine of an angle.
Calculates the tangent of an angle.
The angle from a point 15 meters from
a building to the highest floor of the
building is 45°. How tall is the building?
45 15
1
5
View point
APPLICATIONS:
Trigonometric functions are useful in mathematics and various engineering
calculations. They are often used in astronomical observations, civil
engineering and in calculations involving electrical circuits, as well as in
calculations for physics such as parabolic motion and wave motion.
Trigonometric Functions
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