Cos2x(2Cosx + 1) = 0

Now

Cos2x = 0 , 2Cosx + 1 =0

2x = Cos^-1 (0) , 2Cosx = - 1

2x = π/2 , Cosx = - 1/2

x = π/4 , x = Cos^-1 (- 1/2)

x = 2π/3

Hence x = π/4 x = 2π/3

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