If \( \frac{1-i x}{1+i x}=a+i b \), then \( a^{2}+b^{2}= \) (A) Content not found (B) \( -1 \) (...

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If \( \frac{1-i x}{1+i x}=a+i b \), then \( a^{2}+b^{2}= \)
(A) Content not found
(B) \( -1 \)
(C) none of these
(D) undefined
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