17: Trigonometric Functions — Read

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17.1: Basic trigonometric definitions and facts
17.2: sin, cos, and tan as functions
We now turn to function theoretic aspects of the trigonometric functions defined in the last section. In particular, we will be interested in understanding the graphs of the functions y=sin(x) , y=cos(x) , and y=tan(x) . With an eye toward calculus, we will take the angles x in radian measure.
17.3: Exercises

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