The expression is .
(Substitute in original expression)
(Multiply: )
Option \\'\\' D \\'\\' is right choice.
![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=b28e416094ad459a8363c1a1825dc578.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1171348820f8fb7f585e94366041fb4a.png\")
(Substitute ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=a1c56e63486a4e5fe3cf6ac95e2004cc.png\")
in original expression)![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=dacf545146392c3149fe6670f8df64d7.png\")
(Multiply: ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=73c7fce2f96c831c43abd30e0a3513ce.png\")
)![\"\"](\"/userfiles/image/steps_images/solution.JPG\")