EXAMPLE 1
Evaluate trigonometric functions given a point
Using
x
= –4
,
y =
3
, and
r
=
5
, you can write the
following:
sin
θ
=
y
r
=
3
5
cos
θ
=
x
r
=
4
5
–
tan
θ
=
y
x
=
3
4
–
csc
θ
=
r
y
=
5
3
sec
θ
=
r
x
=
5
4
–
cot
θ
=
x
y
=
4
3
–