Core 3. Discovering the derivative of e^x using a graphics calculator

Core 3. Discovering the derivative of e^x using a graphics calculator

This was born in one of those teaching moments when you begin a story and it threads through your whole lesson. The original analogy snowballed, i hadn't even thought of creating a family (!) but we went on a journey and I have tried to capture the essence of our discussions and enjoyment as we formed our own rules for differentiation!!
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