Charlie,

In cell B1, you can simply enter

=Cos(A1)

and then copy down to B10.

Otherwise, you could select B1:B10, type =Cos(A1) and press

Ctrl-Enter.

Or, your could select B1:B10, type =Cos(A1:A10) and press

Ctrl-Shift-Enter.

If you want to use all the Cosine values in one cell, you could (for

example) sum them using

=SUM(Cos(A1:A10))

entered with Ctrl-Shift-Enter.

A better explanation of what you are doing would help us help you.

HTH,

Bernie

MS Excel MVP