You should not be this far along and still have notation this sloppy.

If you mean

, then you should write that, remembering all that time you spent on the Order of Operations back before Algebra I.

Maybe add some grouping symbols? [6x-sin(6x)]/[6x-tan(6x)]

Note: Really, I am not mocking or being demeaning, but I am trying to get your attention and the attention of anyone reading this post. It IS important to write clearly and to write what you mean. This removes the need for guessing what you mean for those who would like to help. Still friends?