# Help/TeX2pngPlugin

#### Synopsis

Help:WikiPlugin to display mathematical formulae in a Wiki page.

#### Usage

<?plugin TeX2png text="$$(a+b)^n=\sum_{k=0}^n{n\choose k}a^k b^{n-k}$$" ?>

gives

TeX imagepath not writable.#### Arguments

There is only one argument which is the text of the mathematical
expression. This text **must be** enclosed by a dollar $ within a
paragraph or two dollars $$ on a separate line. In the last case,
all is centered.

To write mathematical formulae, the syntax is the one of LaTeX.

#### Caveats

This plugin is only to produce readable mathematical formulae. Any other text is not allowed : so if an expression is not enclosed by dollars then it will be displayed by a red text. It is all the same possible to display raw text as TeX imagepath not writable. by using :

<?plugin TeX2png text="$\textrm{\LaTeX}$" ?>

This plugin is not able to produce sophisticated mathematicals texts with links, cross references... For that, you can use for example LaTeX2html.

#### Examples

Some Greeks letters : TeX imagepath not writable., TeX imagepath not writable., ... and a formula TeX imagepath not writable. to test display in a paragraph.

**Exercise 1** Consider the function TeX imagepath not writable.

- Give the largest real domain for which f(x) is well defined.
- Give a domain on which the function is one-to-one. Using this domain derive a formula for the inverse function TeX imagepath not writable..
- Calculate the derivative f'(x).

**Exercise 2** Consider the function :

- Show that for all r > 0 :TeX imagepath not writable.
**Help**: you can use polar coordinates. - Hence find the limit of TeX imagepath not writable. as x tends TeX imagepath not writable..