Let Z1 = I4 + i5 + I6 + +i12,z2=i4•i5•i6•… The relationship between Z1 and Z2 is () A. Z1 = z2b. Z1 = - z2c. Z1 = 1 + z2d
∵z1=i4+i5+i6… +i12=i4(1−i9)1−i=1−i1−i=1,z2=i4•i5•i6… i12=i4+5+6+… +12 = I (4 + 12) × 92 = I72 = (i4) 18 = 1.. Z1 = Z2
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