Plot Functions with Google Search

Google has recently added a graphing functionality to its search engine. You can now plot functions in Google’s search engine as shown below.  The graphs can be panned and zoomed.
You can also graph multiple functions using commas.  The graphs above were generated by typing x^2, x, sin(x), ln(x) in the search engine. Google is capable of graphing single variable functions including trigonometric, exponential, and logarithmic functions as well as their compositions.

Source: Inside Search