2. TRIGONOMETRIC FUNCTIONS OF GENERAL ANGLES lies in ...

10 r ( x, y) θ O y x . Definition 2.1: Trigonometric Functions of a General Angle Let θ be an angle in standard position and suppose that ( x , y ) is any point other than ( 0 , 0 ) on the terminal side of θ(Figure 2.3).If r = x2 +y2 is the distance between ( x, y ) and ( 0 , 0 ), then the six trigonometric functions of θ are defined by Using similar triangles, you can see that the values ... ................
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