Answer:
Right click a worksheet tab and click unhide.
Step-by-step explanation:
In order to hide a page worksheet tab, right click the worksheet which you want to hide, there will be option to hide and unhide. To unhide, you can right click any of the sheet, then click on unhide.
It will show list of sheets which are hidden in the workbook. Select the desired name so that it will appear. Hiding is different from protecting a sheet.
Hiding will take the sheet from the screen but will not delete. Protect will avoid editing of the sheet until a valid password is given.