\
The expression is
.
\
\
Sum formula of sine function :
.
\
\
\
The exact value of
is
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=69f612f99dcd7f1031ef01934be0d75b.png\")
..![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0c818445faf642d3dfd665f8d65fee39.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=4a13b85ecb552d420d384e68306f9f90.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a8a25217657c4110601115c3b61e59c3.png\")
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=69f612f99dcd7f1031ef01934be0d75b.png\")
is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=5dcc7b11c9a1c4556735a19226c1d784.png\")
.