4) cos 90o =
a) 4 cos 3 30° - 3 cos 30°
c) tan 60° - tan 30°
b) sin 60° + sin 30°
d)2 cos 60° cos 30°
5) tan 60°=
a) 2 cos 30°/1- cos^2 30°
b) 2 tan 30°/ 1-tan ²30°
c) 2 cot 30°/1-cot^2 30°
d) 2sin 60°
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