Let z 1 = r 1 (cos 1 + isin 1 ) and z 2 = r
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Let z1 = r1(cosθ1 + isinθ1) and z2 = r2(cosθ2 +isinθ2) be two complex. Then z1z2 = _____ [cos(____) + isin (____)].
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