Plot a straight line on another graph

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muhammad muda
muhammad muda 2019-11-11
回答： Star Strider 2019-11-11
Hi,
I have a curve line graph that I plot using plot function. How can I put reference lines on it as shown in figure attached?
Any help? Thanks..

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Star Strider
Star Strider 2019-11-11
It looks as though you want to plot tangent lines at specific points on the curve. See How to draw tangent line at infleciton point? for an example.

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