prove that
(ii) cos 60° = cos2 30° - sin2 30°
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Answer:
Step-by-step explanation:
cos 60°=cos2 30°-sin2 30°
cos 1/2=cos2 √3/2-sin2 1/2
cos 1/2= cos2 √3-sin2 1/2
cos = cos^2 √3 - sin^2 1
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