Protect formula from change or how to disappear it?

Dear All,
I ask if it possible to make protection against formula that existed on several fields from changing or disappear the view to be not monitored only by some identifications or password..

I don't know if my message clear but I think it important for save works,,

Ex: I need this formula not appear for other users:

=IF(((ROUNDUP((AK10-AL10)/30,0)*1.5%))>=15%,15%,((ROUNDUP((AK10-AL10)/30,0))*1.5%))

Deeply thanks,

Hey there,

Step 1: Select the entire excel sheet from the little arrow before Column A and above row 1
Step 2: Right Click and got to Format Cells
Step 3: Go to Last option "Protection" and untick Locked and Hidden Checkboxes and click OK
Step 4: Go to the cell where your formula is, for eg b1, right click on it and then go to format cells, protection and now check both locked and hidden checkboxes.
Step 5: Password protect your sheet by going to Review and "Protect Sheet"

This will allow users to edit other cells but not the one with your formula in it.
Hope this helps...

Deeply Thanks, its done...