The statement is .
The statement is False.
Explanation:
Trigonometric pythagorean identity .
The correct statement is .
.
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.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=249f181f77c5456284b0a97b9396f22d.png\")
.![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=249f181f77c5456284b0a97b9396f22d.png\")
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.