An apparatus for evaluating a mathematical function at an input value comprising, means for selecting a mathematical function, means for inputting a value at which to evaluate the function, means for identifying an interval containing the input value, the interval being described by at least one polynomial function, means for retrieving at least one control point representing the polynomial function from at least one look up table, means for deriving the polynomial function from the control points, means for evaluating the function for the input value and means for providing data representing the evaluated function at an output.
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