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x in (-oo:+oo)
tan((2*pi)/6) = x // - x
tan((2*pi)/6)-x = 0
3^(1/2)-x = 0 // - 3^(1/2)
-x = -3^(1/2) // * -1
x = 3^(1/2)
x = 3^(1/2)
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