Wikipedia:Tutorial (historical)/Keep in mind/sandbox
 |  Welcome to the Wikipedia Tutorial sandbox! This page allows you to carry out experiments and practice editing. To edit, click the edit tab above, make your changes and click the Publish changes button when finished. Content will not stay permanently; this page is automatically cleaned every four hours. Please do not place copyrighted, offensive, illegal or libelous content in the sandboxes. For more information and resources on the basics needed to comprehend, comment on, and edit Wikipedia, see Contributing to Wikipedia. If you have any questions regarding Wikipedia, please ask them at the help desk or the Teahouse. If you have registered an account, and you are logged in, you can find or create your own user sandbox here. For future easy access, you can put |
![{\displaystyle f(x)=\sum _{n=0}^{\infty }{\frac {x^{n}}{n!}}\cdot \left[{\frac {d^{(n)}}{dx^{(n)}}}f(x=0)\right]}](/media/api/rest_v1/media/math/render/svg/bfe6f3c12c3c7a878ef5fb59e9a6425fa2f5acd3)