\
The trigonometric expression is
.
\
Rewrite the expression as
.
\
Apply periodic property :
.
\
\
.
\
\
.
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1ed3390c25b4cfeb75c47b643c0c253e.png\")
..![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=6185d23631b0583e3a243172ff72f115.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=d67e664a474161978f71d1950f8beb3a.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=61ca06bb8e4c3a6ae2994a7745e0960d.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=132a9c3a53ce330ec5183f2726210099.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e1194398eef15c298d52fed620dcf703.png\")
.