To Trig or not to Trig?

Mixed ability class. I made a call about who should continue to study Pythagoras, and who should move on to learning about Trigonometry.

In the unit assessment, one glorious student (who I had decided should stay on Pythagoras), flew through the Trig questions, doing better than a lot of the students who had learnt it in class. He had gone home and asked his cousin/youtube to teach him.

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Outstanding example of the dangers of overly rigid differentiation. What should I have done differently?

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