Question

4 cos2 -1 =0 then the value of cosic is ​

Answer 1

Explanation:

4cos2x=3

cos2x=43

cosx=±23

Neglect the negative value, as the angle is acute

cosx=cos30

x=30∘

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Answer 2

4cos2x=3

cos2x=43

cox=+23

cosx=cox30

x=30degree