Teachers' Lesson Study activities to develop mathematical knowledge for teaching (MKT) trigonometric functions

The datasets underpin a thesis titled "Teachers’ development of mathematical knowledge for teaching trigonometric functions through Lesson Study". The study explored how teachers develop and improve their mathematical knowledge for teaching trigonometric functions through Lesson Study. The theoretical lens framing the current qualitative interpretive case study was mathematical knowledge for teaching (MKT). Data were collected using observations, document analysis and semi-structured interviews. The study revealed that Lesson Study afforded teachers an opportunity to develop their mathematical knowledge through collaborative lesson planning discussions (that incorporated all six knowledge domains of MKT) of trigonometric functions; by observing and documenting the manifestations of learners’ mathematical thinking during lesson presentation and observation; and by critically analysing the achievement of lesson objectives, refining and realigning previous and future lessons during post-lesson reflection conversations (that incorporated all six knowledge domains of MKT). Generally, teachers reported gaining content and pedagogic skills in trigonometric functions through participating in Lesson Study.