Besides the tools and capabilities pre-shipped and included in Origin, you are able to install the free Apps to extend graphing and analysis functionality of Origin.
In this lesson, we will show you how to search an App, install and use it to plot a tangent curve at specified point of a line+Scatter plot.
Besides installing apps from App Gallery, you can also go to the OriginLab File Exchange to download the app you desired, drag and drop the opx file into Origin workspace to install it. You can see the details here.
App operations may be window-specific,
You can always access to the document of an App by right-clicking App icon and selecting: