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Find the real part of (1-i)^(-i)....

Find the real part of `(1-i)^(-i)`.

A

`e^(-pi//4)cos((1)/(2)log_(e)2)`

B

`-e^(-pi//4)sin((1)/(2)log_(e)2)`

C

`e^(-pi//4)cos((1)/(2)log_(e)2)`

D

`e^(-pi//4)sin((1)/(2)log_(e)2)`

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