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If a^(2)+ b^(2) = 2 and c^(2) + d^(2) =...

If ` a^(2)+ b^(2) = 2 and c^(2) + d^(2) = 1 ` then the value of `(ad - bc)^(2) + (ac + bd)^(2)` is

A

`(4)/(9)`

B

`(1)/(2)`

C

1

D

2

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