The trigonometric angle is .
A terminal side of lies in Quadrant III,
the reference angle is .
The reference angle is .
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lies in Quadrant III, ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7855daaa466941585750e6eabceccf28.png\")
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.