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rTRIGONOMETRIC IDENTITIES - Wright State University

2. The Elementary Identities Let (x;y) be the point on the unit circle centered at (0;0) that determines the angletrad: Recall that the de nitions of the trigonometric functions for this angle are sint = y tant = y x sect = 1 y cost = x cott = x y csct = 1 x: These de nitions readily establish the rst of the elementary or fundamental identities given in the table below.

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