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On<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1235" altimg="si7.svg"><mml:mrow><mml:mo>(</mml:mo><mml:mi>β</mml:mi><mml:mo>,</mml:mo><mml:mi>γ</mml:mi><mml:mo>)</mml:mo></mml:mrow></mml:math>-Chebyshev functions and points of the interval