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[DEG mode]
<Example>
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:
Trigonometric Functions
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 engi-
neering and in calculations involving electrical circuits, as well as in calcula-
tions for physics such as parabolic motion and wave motion.
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