A complex number z such that |z| = 1 is said to be unimodular complex number. Since |z| = 1, z lies on a circle of radius 1 unit and centre (0, 0).
If |z| = 1 => z = cos Θ + i sin Θ,
=> 1/z = (cos Θ + i sinΘ)-1 = cos Θ – i sinΘ
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