Transcription of Task 1 Interaction (Santino) – Covariational Reasoning Study

We explored the role of specific GeoGebra Applets in the progressive development of a secondary school student's covariational reasoning in the context of sine and cosine functions, during a teaching experiment based on a hypothetical learning trajectory (HLT).Only the transcript corresponding to Task 1 has been made publicly available in this repository, as it is the portion selected for open sharing. The remaining transcripts and supplementary materials contain identifiable or sensitive information and are not publicly available in order to protect the integrity of the research and the anonymity of the participant. Access to additional data may be considered upon reasonable request and subject to ethical review.