SATmath4u.com is the first forum introducing the addition of LaTeX mathematical typesetting for SAT math test.
LaTeX is a professional-grade general typesetting system that centers around very pleasing mathematical presentation. Mathematical expressions are written in a markup style somewhat similar to HTML.
You may include LaTeX graphics in any post here on SATmath4u.com
To include a LaTeX graphic, simply include your LaTeX code within the tags [tex][ /tex]. without spaces.
Or by using the rightmost button in editing bar and then use the math symbols bellow the post area as shown in the following image.


Click image for larger version. 

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Basic Guidelines
Lines and Text. \\ starts a new line, \ includes a space, \mbox{...} includes text

Sub- and Superscripts.
Code:
 [tex]x^3[ /tex]
produces while
Code:
[tex]x_{2n}[  /tex]
produces
Here is another example:
Code:
[tex]\log_{5} 125=3[  /tex]
gives


Fractions. Use \frac to display fractions.
Example:
Code:
[tex]\frac{\pi^2}{6}[  /tex]
gives .

Roots. Use \sqrt. For instance,
Code:
[tex]\sqrt{a^3+b^4}[  /tex]
produces

You can also get “other” roots:
Code:
[tex]\sqrt[4]{5}[  /tex]
yields .

Various examples
Code:
Code:
[tex] \frac{1}{2^n} \rightarrow 0[  /tex]
produces the graphic

Code:
Code:
[tex]\int_a^b f(t) dt = 1[  /tex]
produces the graphic


Code:
Code:
[tex] \sum_{n=0}^{\infty} \frac{1}{n!} = e [  /tex]
produces the graphic


Plus or minus

Code:
[tex]\pm[  /tex]
produces the graphic


multiplication or dot product

Code:
[tex]a\cdot b[  /tex]
produces the graphic



Equals sign and inequalities

To get an equals sign, you simply use the ordinary = sign.
Code:
 [tex]2+3=5[  /tex]
produces the graphic



For 'not equal to', use \not=

Code:
[tex]2^4\not=2[  /tex]
produces the graphic


For less than signs, we use <, and for greater than signs, we use >

For 'less than or equal to' signs, we use \leq, and for 'greater than or equal to' signs we use \geq

Code:
[tex]x^2 \geq 0[  /tex]
produces the graphic


For spaces, use "\ ".

Sigma notation

To write sums, we use the \sum command.

Code:
[tex]\sum_{i=1}^n i^2 = \frac{1}{6}n(n+1)(2n+1) [  /tex]
produces the graphic



Differentiation

We use \frac{}{} to write dy/dx.

Code:
[tex]\frac{d}{dx} x^4 = 4x^3[  /tex]
produces the graphic



For f'(x), simply write it out normally within TeX tags.

Code:
[tex]f'(x)[  /tex]
produces the graphic



Integration

For the integral sign, use the \int command.

Code:
[tex]\int 3x^2\ dx = x^3 + C[  /tex]
produces the graphic


For definite integrals, use the commands for subscripts and superscripts.

Code:
[tex]\int^1_0 x\ dx =0.5[  /tex]
produces the graphic


Modulus sign or absolute value

Use | for the modulus sign.

Code:
[tex]\sqrt{x^2} = |x|[  /tex]
produces the graphic


Factorial

Use the exclamation mark like normal.

Code:
[tex]3! = 6[  /tex]
produces the graphic


n choose r

Code:
[tex]^n\mathrm{C}_r[  /tex]
produces the graphic


Greek Letters

Write \x where x is the written form of the Greek letter (i.e. alpha, beta, gamma, ... , omega).

Code:
[tex]\pi[  /tex]
produces the graphic


Code:
[tex]\theta[  /tex]
produces the graphic


Infinity

To insert the infinity symbol, use \infty.

Code:
[tex]\infty[  /tex]
produces the graphic


Trigonometry

Code:
[tex]\cos \theta[  /tex]
produces the graphic


Code:
[tex]\sin \theta[  /tex]
produces the graphic



Code:
[tex]\tan \theta[  /tex]
produces the graphic


Code:
[tex]\sec \theta[  /tex]
produces the graphic



Code:
[tex]\mathrm{cosec} \theta[  /tex]
produces the graphic



Code:
[tex]\csc \theta[  /tex]
produces the graphic


Code:
[tex]\cot \theta[  /tex]
produces the graphic


Code:
[tex]\sin^2 \theta + \cos^2 \theta=1[  /tex]
produces the graphic




To write 'degrees', you could use the \circ command.

Code:
[tex]\cos 60^{\circ} = \frac{1}{2}[  /tex]
produces the graphic



Logarithms


Code:
[tex]\ln x^5 = 5 \ln x[  /tex]
produces the graphic


Code:
[tex]\log_{10} x^2 = 2 \log_{10} x[  /tex]
produces the graphic


Matrices

Code:
[tex]\begin{pmatrix} -2 & 6 & 7 \\2 & -5 & 1 \\1 & 2 & 3 \end{pmatrix}[  /tex]
produces the graphic


Determinants

Code:
[tex]\begin{vmatrix} -2 & 6 & 7 \\2 & -5 & 1 \\1 & 2 & 3 \end{vmatrix}[  /tex]
produces the graphic



vectors, simply write a matrix with only one column:

Code:
[tex]\begin{pmatrix} x \\ y \\ z \end{pmatrix}[  /tex]
produces the graphic


Code:
[tex]\vec{a}[  /tex]
produces the graphic


Limits

Code:
[tex]\displaystyle\lim_{x\to 0}[  /tex]
produces the graphic



Sets

Code:
[tex]\cup[  /tex]
produces the graphic



Code:
[tex]\cap[  /tex]
produces the graphic



Code:
[tex]\subset[  /tex]
produces the graphic



Code:
[tex]\subseteq[  /tex]
produces the graphic



Code:
[tex]\nsubseteq[  /tex]
produces the graphic



Code:
[tex]\in[  /tex]
produces the graphic



Code:
[tex]\not\in [  /tex]
produces the graphic



Code:
[tex]\mathbb{P}[  /tex]
produces the graphic



Code:
[tex]\mathbb{N}[  /tex]
produces the graphic



Code:
[tex]\mathbb{Z}[  /tex]
produces the graphic



Code:
[tex]\mathbb{I}[  /tex]
produces the graphic



Code:
[tex]\mathbb{Q}[  /tex]
produces the graphic



Code:
[tex]\mathbb{R}[  /tex]
produces the graphic



Code:
[tex]\mathbb{C}[  /tex]
produces the graphic



Code:
 gives
produces the graphic


Logic Symbols

Code:
[tex]\forall[  /tex]
produces the graphic



Code:
[tex]\land[  /tex]
produces the graphic



Code:
[tex]\lor[  /tex]
produces the graphic



Code:
[tex]\exists[  /tex]
produces the graphic



Code:
[tex]\neg[  /tex]
produces the graphic



Code:
[tex]\sim[  /tex]
produces the graphic