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Question: If z = \(\frac{\sqrt{3} + i}{2}\), then (z<sup>101</sup> + i<sup>103</sup>)<sup>105</sup> is equal t...

If z = 3+i2\frac{\sqrt{3} + i}{2}, then (z101 + i103)105 is equal to

A

z

B

z2

C

z3

D

None of these

Answer

z3

Explanation

Solution

Sol. z = i(13i)2\frac{i(1 - \sqrt{3} ⥂ i)}{2} = –iw

z101 + i103 = (– iw)103 + i103 = –iw2 – i = iw

(z101 + i103)105 = (iw)105 = i (w3 = 1, i4 = 1)

Also, z = – iw ¹ i, z2 = (–iw)2 = – (w2) = –w2 ¹ i

z3 = (– iw)3 = –i3w3 = i

so, (z101 + i103)105 = z3