Is there a way to get rid of white space when using "hide left-hand side"

[igriffiths]

I have a rather large formula that I'm trying to show with an explicit function, as it is too big I cannot do this all on one line. Is there a way to have:

x= big big function

x= big big function explicit,ALL (hide left-hand side, hide key words)
x= answer

without the explicit function leaving a big space for the hidden formula?

example doc attached

[Werner_E]

I don't know of any way to achieve exactly what you want, but you sure can make it a little bit less ovious

If you don't want the definition of Phi with all its if-statements to be seen, you may hide it in a collapsed region.