Given two complex numbers z1 = r1 (cos 1 + i sin 1) and z2 = r2

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Given two complex numbers z1 = r1 (cos θ1 + i sin θ1) and z2 = r2 (cos θ2 + i sin θ2), z2 ≠ 0, show that z1 / z2 = r1 / r2 [cos (θ1 θ2) + i sin (θ1 θ2)].
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