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[" Let "f(x)=x" and "g(x)=|x|" for all "x in R" .Then the function "phi(x)" satisfying "],[[phi(x)-f(x)]^(2)+[phi(x)-g(x)]^(2)=0" is: "],[[" (A) "phi(x)=x,x in[0,oo)," (B) "phi(x)=x,x in R],[" (C) "phi(x)=-x,x in(-oo,0]," (D) "phi(x)=x+|x|.x in R]]

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