1. Create a new demo by following these steps:
- Add an interval x which goes from -1 to 1 in 20
steps.
- Add a variable a which goes from -1 to 1 in 10
steps.
- Add a function f(x), and type in any expression
for it.
- Add a 2D graph window which shows the function graph of f(x)
and plots the point (a, f(a)).
2. Create a demo which shows a graph of the function f(x)
and also graphs the tangent line to f(x) at some point, x0.
3. Create a demo based on your favorite calculus topic
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