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Shashank told you how to do it in matplotlib (which comes with Sage) - matplotlib allows you a lot of control over your plots, but as you can see, it involves a fair bit of boilerplate compared to Sage's plotting.

If you want to add a formula to a Sage plot, then you can just use latex inside dollar signs, like you would in a .tex document:

text(r"Here's a formula $\frac{\sqrt{3}}{2}$ and some text",(1,2))

Here the r" is necessary due to all the slashes in the string–if you don't include the r then you'll have to escape each of the slashes (check out the python String documentation for more info on that).

Shashank told you how to do it in matplotlib (which comes with Sage) - matplotlib allows you a lot of control over your plots, plots (I often use it for this reason), but as you can see, it involves a fair bit of boilerplate compared to Sage's plotting.

If you want to add a formula to a Sage plot, then you can just use latex inside dollar signs, like you would in a .tex document:

text(r"Here's a formula $\frac{\sqrt{3}}{2}$ and some text",(1,2))

Here the r" is necessary due to all the slashes in the string–if you don't include the r then you'll have to escape each of the slashes (check out the python String documentation for more info on that).