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### About the Authors

María Burgos (ResearcherID: L-5265-2014, MR Author ID: 803300) is currently an assistant professor in the Department of Didactics of Mathematics at the University of Granada, Spain. She has a PhD in Mathematics and a Master's degree in Didactics of Mathematics. Her main research areas are functional analysis, mathematics education, instructional design, and teacher training.

Pablo Beltrán-Pellicer (ResearcherID: K-2196-2017) is an assistant professor in the Area of Didactics of Mathematics at the University of Zaragoza, Spain, and a secondary education teacher. He has a PhD in Didactics, and his research interests are analysis and design of educational sequences, use of specific resources (audiovisual, technological, etc.), and theory of mathematics education.

### Acknowledgements

The first author is partially supported by FQM126 Research Group (Junta de Andalucía, Spain). The second author is supported by MINECO EDU2016-74848-P and S36-17D Research Group in Mathematics Education (Government of Aragón, European Social Fund). The authors would like to thank the students and teachers who made possible this rewarding experience. They would also like to acknowledge P. A. García-Sánchez and J. D. Godino for their valuable comments and suggestions, and Janet Beery for her support in the reviewing process.