The function is .
Rewrite the expression.
Take out common factors.
Perform subtraction and addition.
.
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![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=2d3e7297729a6474274b1119225ed760.png\")
.![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=517f706be1c1b8e377a7eca5ebeb94b7.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=141df3ebd5d68b8f8d2d905dd3444520.png\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e19abaa8b07e0042f5cb19d1164ac614.png\")
![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=52b51afe41280158f5a01492e052ab21.png\")
.