Find .
The trigonometric function .
Since the angle terminates in QI, all trigonometric functions are positive.
Pythagorean identity : .
Consider .
Substitute the value of in above identity.
The value of .
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terminates in QI, all trigonometric functions are positive.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6a6b4b3237866a74df18436834ed0555.png\")
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in above identity. ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=565d7cfc9b4a6f27ef8ade5c50bdf4a1.png\")
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.