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Cosine and Secant Functions (Special Property)

Author:
Tim Brzezinski
Topic:
Cosine, Functions, Trigonometric Functions
Suppose is an angle drawn in standard position. Let P(x, y) = any point in the coordinate plane, and r = distance from point P to the origin. If this is the case, recall and . Interact with the applet below for a minute or two. Then answer the questions that follow. (Be sure to move point P to various locations!)

1.

Regardless of where point P lies, what relationship can you write about the ratios and ?

2.

Regardless of where point P lies, what relationship can you write about the ratios and ?

3.

What do these 2 observations imply about the cosine and secant functions? (Click here and/or here for a hint!)

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