The trigonometric function is .
The terminal side of in Quadrant III , the reference angle is
The sine function is negative in Quadrant III,
so .
.
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in Quadrant III , the reference angle ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e7c781231a59c1b36c9f5db5a034b92b.png\")
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. ![\"graph](\"/userfiles/image/Library/Algebra%202/graph%20of%20the%20trigonametry%20degrees%20sin240.gif\")
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.