To add a trendline in Google Sheets, you first need to select the data you want to trend. Once the data is selected, click on the "Chart" tab at the top of the screen and select the type of chart you want to create. After you've selected the chart type, a menu will appear on the right side of the screen. Under the "Chart options" heading, there will be a section called "Trendline." Click on the "Add trendline" button and a menu will appear with a variety of trendline options. Select the type of trendline you want to use and Google Sheets will add it to your chart.
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