3(cos 120° + j sin 120°) × 5(cos 45° + j sin 45°)

= (3)(5)(cos(120° + 45°) +j sin(120° + 45°)

= 15 [cos(165°) +j sin(165°)]

In this example, the r parts are 3 and 5, so we multiplied them. The angle parts are 120° and 45°, and we added them.

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