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tan θ = √3.
tan-1(√3) = π/3 radians or 4π/3 radians, in degrees it would be 60° or 240°
tan θ = sin θ / cos θ
So, tan (π/3) = sin (π/3) / cos (π/3) = tan (4π/3) = sin (4π/3) / cos (4π/3)
cos (π/3) = 1/2
cos (4π/3) = -1/2
Therefore cos θ = 1/2 or -1/2 when tan θ = √3
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