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If you know the Excel function that you need and remember some of the details, you can get a very helpful reminder by typing =function (where function is the name of the function that you want to use, e.g. Sum or If or whatever), holding down Ctrl and Shift and pressing A.
The arguments for the function are inserted into the cell and you can type over them (remember that you can double click on each part to select it and then just type to replace it).