Q.

If α, β are distinct complex numbers with β=1, then value of β-α1-α¯ β equals

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a

1

b

α

c

2

d

none of these

answer is A.

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Detailed Solution

β=1⇒ββ¯=1∴ β−α1−α¯β=β−α1−α¯/β¯=β¯(β−α)β¯−α¯=|β||β−α||β¯−α¯|=|β|(1)=1.                               [∵ |z|=|z¯|]
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