Angles as Variables

All kinds of ìobjectsî can be variables.

Usually we think of variables as numbers:

f(x) = 3x2 ñ 2x + 1

f(-2) = 12 + 4 + 1 = 17

But last lecture, for example, we had another function as a variable:

f(x) = g(h(x)), e.g. f(x) = 3e2t^3

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