[" 4.The maximum value of "cos^(2)((pi)/...

[" 4.The maximum value of "cos^(2)((pi)/(3)-x)-cos^(2)((pi)/(3)+x)" ,is "],[[" (a) "(sqrt(3))/(2)," (b) "(1)/(2)," (c) "-(sqrt(3))/(2)," (d) "(3)/(2)]]

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