A text box will appear along with a new toolbar with drop-down menus for Greek letters miscellaneous operations relations math operators and arrows. Ive some examples of the use of Google Sheets CHOOSE function. Open a document click where you want to insert an equation and then select Insert Equation.
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For example subtract the values you entered in cells B3 and B4 for the MINUS function. A dotted border will appear around the cell being referenced. Click the cell where you want to use the function. Use your mouse pad or a stylus to handwrite your maths.