6.2b Six Trigonometric Functions of Any Angle (Special Angles)

6.2b Six Trigonometric Functions of Any Angle 

(B) Special Angles

(1) Value of Special Angle 30° and 60°
 
  (a)sin 30 o = 1 2  (b)cos 30 o = 3 2 (c)tan 30 o = 1 3   (d)sin 60 o = 3 2   (e)cos 60 o = 1 2    (f)tan 60 o = 3  


(2) Value of Special Angle 45°
 
 
  (a)sin 45 o = 1 2   (b)cos 45 o = 1 2   (c)tan 45 o =1     


(3) Value of Special Angle 0°, 90°, 180°, 270°, 360°
 
(a) y = sin x
 



x
0o
90o
180o
270o
360o
sin
0
1
0
-1
0

(b) y = cos x






(c) y = tan x
 


x
0o
90o
180o
270o
360o
tan 
0
  ∞
0
  ∞
0

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