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= sin (8.360 + 120°)
= sin 120
= sin (180 - 120)
= sin 60
= 1/2 √3
c) sin 5π/4 = sin (k.2π + α)
= sin (1. 2π - 3/4 π)
= sin (-3/4 π)
= - sin 3/4 π
= - 1/2 √2
e) sin 45 = 1/2 √2
cos 135 = - cos (180-135)
= - cos 45
= - 1/2 √2
tan 120 = - tan (180-120)
= - tan 60
= -√3
sin 60 = 1/2 √3
cos 30 = 1/2 √3
= (1/2 √2. 1/2 √3) + (-√3)² / (2. 1/2 √3. 1/2 √3)
= (1/4 √6 + 3) / (3/2 )
= (1/2 √6 + 6) / 3
= 1/6 √6 + 2