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Right-click on it, and select "Show Source". You can try it here: $\sum_x 2f(v_x)^2$. Note that the MathJax menu (which contains the item “Show Source”) may be behind the context menu of your browser.
Right-click on it, and select "Show Source". You can try it here: $\sum_x 2f(v_x)^2$. Note that the MathJax menu (which contains the item “Show Source”) may be behind the context menu of your browser.
Right-click on it, and select "Show Source". You can try it here: $\sum_x 2f(v_x)^2$. Note that the MathJax menu (which contains the item “Show Source”) may be behind the context menu of your browser.
Right-click on it, and select "Show Source". You can try it here: $\sum_x 2f(v_x)^2$. Note that the MathJax menu (which contains the item “Show Source”) may be behind the context menu of your browser.
Right-click on it, and select "Show Source". You can try it here: $\sum_x 2f(v_x)^2$. Note that the MathJax menu (which contains the item “Show Source”) may be behind the context menu of your browser.