4cos^2 (x/3)=3
cos^2 (x/3)=3/4
cos (x/3)= √3/2
x/3 = π/6 + 2 πn |×3
x= π/2 + 6 πn
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4cos^2 (x/3)=3
cos^2 (x/3)=3/4
cos (x/3)= √3/2
x/3 = π/6 + 2 πn |×3
x= π/2 + 6 πn