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Question

If |z1| = 2, & z2 be the point in which sartisfies the condition (z2+¯¯¯¯¯z2)i(z2¯¯¯¯¯z2) = 82, then the minimum value of |z1z2| is

A
2
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B
2.0
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C
2.00
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Solution

iven: |z1|=2, (z2+¯¯¯¯¯z2)i(z2¯¯¯¯¯z2)=82

|z1| = 2x2+y2 = 4

(z2+¯¯¯¯¯z2)i(z2¯¯¯¯¯z2) = 82x+y = 42


AB = OBrAB = 2

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