Using the formula cos2Ф = 2 cos² Ф - 1, find the value of cos 30°, it is being given that
cos 60° = 1/2
Answers
Answered by
1
cos 60° = 1/2 = 2 cos² 30° - 1
2 cos² 30° = 1+1/2 = 3/2
cos² 30° = 3/4
cos 30° = √3/2
2 cos² 30° = 1+1/2 = 3/2
cos² 30° = 3/4
cos 30° = √3/2
Similar questions