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If f,g,h:R to R are defined by f(x)=x-1,...

If `f,g,h:R to R` are defined by `f(x)=x-1, `
`g={{:((x^(2)-1)/(x+1),,"if",,x ne -1),(-2,,"if",,x =-1):}`
`h(x)={{:((x^(3)+2x^(2)-2)/(x^(2)+3x+2),,"if",,x ne -1,xne-2),(-2,,,,"if",x=-1),(-3,,,,"if",x=-2):}`
`f(x)+g(x)-2h(x)` is
1) not a polynomial
2) a polynomial whose degree is undefined
3)a polynomial of degree zero
4) a polynomial of degree one
5) None of these

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