A) $ {1,-1} $
B) $ {1} $
C) $ {-1} $
D) None of these
Correct Answer: B
[b] $ x^{2}-2x+3={{(x-1)}^{2}}+1>0,\forall ,x\in R $ Or $ f(x)=sgn(x^{2}-2x+3)=1. $ hence, the range is {1}.
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