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Trigonometric Identities Unit Circle

Trigonometric Identities Unit Circle
Trigonometric Identities 1
Trigonometric Identities
Basic Identities:
sin θ =
y
r
( 1 )
cos θ =
x
r
( 2 )
tan θ =
y
x
=
sin θ
cosθ
( 3 )
cot θ =
x
y
=
cos θ
sinθ
=
1
tan θ
( 4 )
sec θ =
r
x
=
1
cos θ
( 5 ) csc θ =
r
y
=
1
sin θ
( 6 )
x
y
r
θ
4π/3
5π/4
7π/6
2π/3
5π/3
5π/6
3π/4
π/6, 30°
π/4, 45°
7π/4
3π/2
π
θ
cos θ
sin θ
1
Unit Circle
0
π/3, 60°
11π/6
π/2, 90°
Trigonometric Identities Unit Circle Page 1
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