@param function Function f(x) to find root of
@param startLow Low-valued x from which to start search
@param startHigh High-valued x from which to start. You typically give startLow and startHigh so thatyou expect the signs of the functions at these values to be different.
@param tolerance Max acceptable |f(x)| for which to return x
@return x for which |f(x)| <= tolerance
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