The trigonometric angle is .
A terminal side of lies in Quadrant IV,
the reference angle is .
The reference angle is .
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lies in Quadrant IV, ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=9e30ecc6de6df1bcce8fa4bce222da54.png\")
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.