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Practice corner: derivatives

Below you have two graphs - if you click on the forward button, at each click you will see the following appear in sequence: 1) on the right hand panel you have a function (appearing in blue), with its equation; then a point on the function; then the tangent line to the function at point , and finally the slope of the tangent line to at point , which is coloured in green. 2) On the left hand panel you have instead a point , then a box where you can input the expression for the derivative of .