Find the product of z1 = (cos 60°+i sin 60°) and z2 = 9(cos 20° +i sin 20°) where Ose < 360°. 222 = 9.67 cis 80° 123 = 6 cis 80° 2²2 = 6cis40° 2 O z22 = cis 40° 27

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