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Given the complex number Z1 = 4( cos + i sin 47r 9 9 and Z2 = 2( cos 137 18 + i sin 18 "), express the result of z1Z2 in rectangular form with fully simplified fractions and radicals. Given the complex number z1 = 18v3( cos " + i sin " ) and z2 = 3( cos 7 + i sin 7 ), express the result of ~ in rectangular form with fully simplified fractions and radicals