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BITSAT2010MathematicsPermutation and CombinationActual

If ( 1-i 1+i =A+i B ), then (A^2+B^2 ) equals to

Options

  1. A1
  2. B( ^2 )
  3. C-1
  4. D(- ^2 )

Correct answer

A. 1

Step-by-step solution

( aligned & A+i B= 1-i 1+i A-i B= 1+i 1-i & (A+i B)(A-i B)= (1-i )(1+i ) (1+i )(1-i ) =1 & A^2+B^2=1 aligned )

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