Quick Review
There are six possible ratios of two sides of a triangle. The ratios are functions of 
and are trigonometric functions.
The six trigonometric functions are defined as:
The values of x and y may be positive, negative, or zero, but r is always positive.
Example 1
Given the point (-8,15) on the terminal side of an angle , find the six trigonometric functions of .
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Example 2
Given the point (3,-5) on the terminal side of an angle , find the six trigonometric functions of .
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(csc should be negative)