
References
^ (2013). Precalculus with Calculus Previews : Expanded Volume ECampus. ISBN 9780763766313 (revised Jan 2024)^ Zill, Dennis G. (2015). Precalculus with Calculus Previews : Expanded Volume, Jones & Bartlett Learning. BiggerBooks. ISBN 9780763766313 (revised Nov 2023)
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