If you are using Wolfram|Alpha to plot Math graphs, now no more. Google has started showing an interactive graph on Google.com. Now, you can plot mathematical functions right on the search result page, when you search for a Math function or a list of functions separated by commas, Google shows.
Just type in a function and you'll see an interactive graph on the top of the search results page.
"You can zoom in and out and pan across the plane to explore the function in more detail. This feature covers an extensive range of single variable functions including trigonometric, exponential, logarithmic and their compositions, and is available in modern browsers," explains Google.
For example, you can search for [sin(x)/x, 1/x^2] to see this beautiful SVG graph.
Or, search for [sin(x) from -pi to pi] or add extraneous words like "plot", "graph" to the query (example: [graph ln(x)]).