The series is .
Find the value of the domain when the series is converges.
.
The series is converges when .
Therefore, the domain of the series is .
The domain of the series is .
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e7277d4f58d4d33463f14e52cf606bb9.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a2ee105c7721a8dd6eb49415825c7440.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2e79ec992cc82ec1eae6236ac139f1a1.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7827f268018931a12ab3769f094c8ee8.png\")
.![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=7827f268018931a12ab3769f094c8ee8.png\")
.