after this what should I have to do
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4 Cos^3 A - 3 cos A = 0
cosA ( 4 cos^2 A -3) = 0
cos A = 0 or 4 cos^2 A = 3
cos^2 A= 3/4
cos A = √3/2
A = 30
cosA ( 4 cos^2 A -3) = 0
cos A = 0 or 4 cos^2 A = 3
cos^2 A= 3/4
cos A = √3/2
A = 30
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