Give me more infos. What did you try? Which version of Excel are you using?
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How are you putting in the equations? Are you using the equation editor?
Im using the 15/16 not sure which, and I tried the paste rotation like on the page. my equations are base off other cells (ex: =A1+F2) but it would return a format error, but it's what ever, I end up retyping it and dragging for the rest of the cell