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
–