Maths in the holidays: Going back over Differentiation from first principles, trying to understand what differentiation is and then working slowly and logically through the process by inspecting different points of a graph and calculating the gradient of the curve at that point
The book uses h but I prefer delta x meaning a little bit of x and suddenly the students were happy and could see what was going on. Similarly with the fractions - the students said they could do fractions until we tried them.
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