Asked • 04/25/25

How to display vertical tangent lines on Desmos?

Using sliders on Desmos it is possible to display tangent lines at a movable point on a function's graph. But if the tangent line is vertical, i.e. slope is undefined, the tangent line is not displayed at that point. Is there a way to have Desmos automatically display the vertical tangent line?

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Inactive Tutor answered • 04/25/25

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desmos.com/calculator/aar3tmuww2


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Inactive Tutor

This graph uses the function y = sin(x), which does not have a vertical tangent line, but shows that when slope equals zero the horizontal tangent line is displayed: desmos.com/calculator/xdenbeuvgd
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04/25/25

Inactive Tutor

Whoops. I did not share my entire screen during the screen share, so Desmos did not appear in the video. Visit the graph to see what was being discussed.
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04/25/25

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