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### Math notations, symbols and equations ### Math notations, symbols and equations

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You can type math when posing a message. Your input should be in tex style (latex), enclose the content in a double \$ sign. For example, the following code

$$\frac{c}{\sqrt{a^2+b^2}} \int_a^bf(x)dx=?$$

will give you this:

$$\frac{c}{\sqrt{a^2+b^2}} \int_a^bf(x)dx=?$$.

Note that we the beginning is $$and the end is$$. later on, we will omit them when mentioning the word "code". They can also be replaced with double dollar sings without space at the beginning and at the end (still treated as inline math, which is different than tex programs on your computer, which treat contents wrapped in between double dollar signs as a new line equation). To make the equation stand out as a new line, you can wrap your contents between the pair $$\backslash\left[ \begin{array}{c} \text{ and } \end{array}\backslash\right]$$, for example, $$\backslash\left[ \begin{array}{c} \text{ \frac{c}{\sqrt{a^2+b^2}} \int_a^bf(x)dx=?} \end{array}\backslash\right]$$

The code  \left( \begin{array}{ccc} a_{11} & a_{12} & a_{13}\\a_{21} & a_{22} & a_{23}\\a_{31} & a_{32} & a_{33}\\ \end{array} \right)

will give you a 3 by 3 matrix:

$$\left( \begin{array}{ccc} a_{11} & a_{12} & a_{13}\\a_{21} & a_{22} & a_{23}\\a_{31} & a_{32} & a_{33}\\ \end{array} \right)$$

You can also click the square root alpha $$\sqrt\alpha$$ sign near the smiley face to insert formula (currently, the nth root will not work).

<div class="math">\left( \begin{array}{ccc} a_{11} & a_{12} & a_{13}\\a_{21} & a_{22} & a_{23}\\a_{31} & a_{32} & a_{33}\\ \end{array} \right) </div>

gives:

$$\left(\begin{array}{ccc} a_{11} & a_{12} & a_{13}\\ a_{21} & a_{22} & a_{23}\\ a_{31} & a_{32} & a_{33} \end{array}\right)$$

<div class="math">\frac{c}{\sqrt{a^2+b^2}} \int_a^bf(x)dx=?</div> gives

$$\frac{c}{\sqrt{a^2+b^2}} \int_a^bf(x)dx=?$$