4 The diagram shows a sketch of the curve with equation \(y = \mathrm { f } ( x )\).
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- On the axes below, sketch the curve with equation \(y = | \mathrm { f } ( x ) |\).
- Describe a sequence of two geometrical transformations that maps the graph of \(y = \mathrm { f } ( x )\) onto the graph of \(y = \mathrm { f } ( 2 x - 1 )\).