d. 20 ( cos 120° +isin 120°) Based on De moi vre's theorem, the given below is equi valent to whi ch the following? s (cos 30°+ isin 30 CoS a. 625 (co cosjao° ti sin i20) b. 625 (cos 810000° + i sin 18009 c. 20( cos 20' t' sin 2o°)

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