If f and g are two functions from R to R which are defined as `f(x)=x^(2)+x+1 and .

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If f and g are two functions from R to R which are defined as `f(x)=x^(2)+x+1 and g(x)=2x-1` for each `x in R `, then show that (fog) (x) `ne` (gof) (x).
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