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Let z1 be a complex number with abs(z1)=...

Let z1 be a complex number with `abs(z_1)=1`and z2 be any complex number, then `abs(frac{z_1-z_2}{1-z_1barz_2}) = `

A

A)0

B

B)1

C

C)-1

D

D)2

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