Let f (x) =x and g (x) = |x| for all . ...

Let f (x) =x and g (x) = |x| for all . Then the function satisfying `[phi (x)-f(x)]^(2)+[phi (x)-g(x)]^(2)=0` is

`phi(x)=x, x in [0,oo)`

`phi(x)=x, x in R `

`phi(x)=-x,x in (-oo,0]`

`phi(x)=x+|x|,x in R `

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