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A result (the answer!).
The steps needed to reach the answer.
Some form of written explanation to describe how you achieved the steps.
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We currently display the most frequently used LaTex symbols on our Equation Editor. Even more buttons are coming soon, but here's a library of LaTeX symbols you might find useful. Use ''ctrl + F'' to search for a specific symbol. Remember to use dollar signs! To see what a symbol looks like, click on it and you'll be redirected to its mathurl generated image. If clicking on it does not work, it means that the mathurl image does not exist. For examples on how to use matrices and align functions, go to the end of the list.
Symbol 
LaTex  Click to see 


$ sign  \$  
absolute value  \left a \right  
alpha  \alpha  
ampersand  \&  
and  \vee  
angle sign  \angle  
approximation (two tildes)  \approx  
arc  \stackrel{\frown}{AB}  
arc cosine  \arccos  
arc cotangent  \arccot  
arc sine  \arcsin  
arc tangent  \arctan  
beta  \beta  
congruent  \cong  
cosecant  \csc  
cosine  \cos  
cotangent  \cot  
cursive l  \ell  
degree symbol  \textdegree  
Delta  \Delta  
division  \div  
dot  \cdot  
dot dot dot  \dots  
double arrow  \leftrightarrow  
empty set  \emptyset  
equals sign with tilde  \simeq  
for every, for all  \forall  
fraction  \dfrac{a}{b}  
greater than  \textgreater  
greater than or equal to  \geq  
in  \in  
infinity  \infty  
infinity  \infty  
integers  \mathbb{Z}  
integral  \int  
integral from a to b  \int_{a}^{b}  
integral from blank to blank  \int_{a}^{b}  
integral over a closed path  \oint{a}^{b}  
integrate f from a to b  \left[ f \right]_{a}^{b}  
intersection  \cap  
iota  identity relation  \imath  
left braces  \left\{  
left bracket  \left[  
left parenthesis  \left(  
left/right braces  \left\{ \right\}  
left/right brackets  \left[ \right]  
left/right parentheses  \left( \right)  
less than  \textless  
less than or equal to  \leq  
limit with arrow  \lim_{x \rightarrow a}{f}  
line break  \\  
ln (natural log)  \ln  
ln equivalence  \ln x^k = k \ln x  
log  \log  
log base a  \log_a x^k  
log equivalence  \log_a x^k = k \log_a x  
long division (polynomials)  \polylongdiv{x^3+x^21}{x1}  
mu  \mu  
multiplication  \times  
natural numbers  \mathbb{N}  
negation of  \sim p  
not congruent  \ncong  
not equal to  \ne  
not parallel  \nparallel  
not, negation  \neg  
notation for a line  \overleftrightarrow{A}  
or  \wedge  
over line; notation for a line segment & complement  \overline{A}  
parallel  \parallel  
partial derivative  \partial x  
percent  \%  
perpendicular  \bot  
pi  \pi  
plus or minus  \pm  
power set symbol  \wp  
predicate equivalence  \equiv  
prime  \prime  
product notation with limits  \prod \limits_{i=1}^N x_i  
proper subset  \subset  
proper superset  \supset  
rational numbers  \mathbb{Q}  
real numbers  \mathbb{R}  
right arrow  \rightarrow  
right braces  \left. \right\}  
right bracket  \left. \right]  
right parenthesis  \left.\right)  
right\left braces  \left\{ a \right\}  
right\left brackets  \left[ a \right]  
right\left parentheses  \left( a \right)  
secant  \sec  
sigma  \sigma  
similar to  \sim  
sine  \sin  
specific root  \sqrt[3]{x }  
square  \square ABCD  
square root  \sqrt{a}  
strikethroughdiagonal  \cancel{}  
subscript  D_{x}  
subset  \subseteq  
summation  \sum  
summation with a and b  \sum_{a}^{b}  
summation with limits  \sum \limits_{k=1}^N k^2  
superscript  a^{b}  
superset  \supseteq  
synthetic division***  \polyhornerscheme[x = 3]{6x^3  4x^2 + 17}  
tangent  \tan  
text insert  \text{some text}  
there exists  \exists  
there exists only one  \exists!  
therefore  \therefore  
theta  \theta  
triangle  \triangle ABC  
union  \cup  
vector arrow  \vec{AB} 
Examples!  
Example: Addition or Subtraction  \begin{align*} \\  
3.47 \\  
\underline{0.92}  
\end{align*}  
Example: Addition or Subtraction in Equations  \begin{array}{ccccccc}  
2.2x&+&5&=1.2x&4 \\  
1.2x & & & 1.2x &  
\end{array}  
Example: Systems of Equations  \begin{displaymath}  
\left\{ \begin{array}{lr} x + y = 50\\  
x + 43 = 2y  
\end{array} \right.  
\end{displaymath}  
Example: The Matrix*  \begin{bmatrix}  
a &b & c \\  
d & e & f\\  
g & h & i \end{bmatrix}  
Example: The Determinant*  \begin{vmatrix}  
a & b & c \\  
d & e &f \\  
g & h & i  
\end{vmatrix}  
Example: Augmented Matrix**  \left[\begin{array}{cccc}  
a&b&c&d\\  
e&f&g&h  
\end{array} \right]  
Example: 6 Trig Identities  \begin{align*}  
\sin x &= a & \csc x &= b \\  
\cos x &= c & \sec x &= d \\  
\tan x &= e & \cot x &= f  
\end{align*}  
Example: The Align Function*  \begin{align*}  
10x &= 2x + 4 \\  
10x  2x &= 4 \\  
8x &= 4 \\  
x &= 2 \end{align*}  
*This expression does not require dollar signs.  
**The number of c's indicates the number of columns. "\\" indicates the start of a new row. This expression does not require dollar signs.  
***The link goes to an example on the Slader site. 