`4cos^2 (x) - 1 = 0` Solve the equation.

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Solve the equation `4cos^2(x)-1=0`

`4cos^2(x)=1`

`cos^2(x)=1/4`

`cos(x)=+-sqrt(1/4)`

`cos(x)=+-1/2`

`x=pi/3+pin`

`x=(2pi)/3+pin`

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