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Given that z1 = 6 - j8, z2 = 10 -30o, and z3 = 8e j120o, find: (a)

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Given that z1 = 6 - j8, z2 = 10 ∠ -30o, and z3 = 8e − j120o, find:
(a) z1 + z2 + z3
(b) z1z2 / z3

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