If a is equal to 60 degree prove that cos 2a is equal to 1
Answers
Answered by
0
Cos a = cos 60
Or, cos 60 = 1/2
Therefore, 2cos60 = 2×1/2 = 1
Or, cos 60 = 1/2
Therefore, 2cos60 = 2×1/2 = 1
Similar questions