Prove that :
cos2 30° - sin2 30° = cos 60°
16 Likes
Answered By
5 Likes
cos 30°. cos 60° - sin 30°. sin 60° = 0
cosec2 45° - cot2 45° = 1
3 cosec2 60° - 2 cot2 30° + sec2 45° = 0.