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fuoction \( f : \mathbf { R } \rightarrow \mathbf { R } \) by \( y = f ( x ) = x \) for each \( x \in R \) . Such a function is called the ideariny function. Here the domain and range of fare R. The graph is a straight line a shown in Fig 2.8 . It passes through the origin \( f ( x ) = x \)

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