new one

- Loser66

new one

- katieb

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- Loser66

\[[\large \log \sqrt{x^2+y^2}]' = \dfrac{1}{\sqrt {x^2+y^2}} \times \dfrac{d}{dx}(\sqrt{x^2+y^2}) \\ \large = \dfrac{1}{\sqrt {x^2+y^2}} \times \dfrac{1}{2 \sqrt{x^2+y^2}}\dfrac{d}{dx}(x^2+y^2)=....\]
[\large \log \sqrt{x^2+y^2}]' = \dfrac{1}{\sqrt {x^2+y^2}} \times \dfrac{d}{dx}(\sqrt{x^2+y^2}) \\ \large = \dfrac{1}{\sqrt {x^2+y^2}} \times \dfrac{1}{2 \sqrt{x^2+y^2}}\dfrac{d}{dx}(x^2+y^2)=....

- Loser66

\[[\large \log \sqrt{x^2+y^2}]' = \frac{1}{\sqrt {x^2+y^2}} \times \frac{d}{dx}(\sqrt{x^2+y^2}) \\ \large = \frac{1}{\sqrt {x^2+y^2}} \times \frac{1}{2 \sqrt{x^2+y^2}}\frac{d}{dx}(x^2+y^2)=....\]
[\large \log \sqrt{x^2+y^2}]' = \frac{1}{\sqrt {x^2+y^2}} \times \frac{d}{dx}(\sqrt{x^2+y^2}) \\ \large = \frac{1}{\sqrt {x^2+y^2}} \times \frac{1}{2 \sqrt{x^2+y^2}}\frac{d}{dx}(x^2+y^2)=....

- hartnn

same syntax ? no...
the first one is \dfrac
and 2nd is just \frac
\(\dfrac{test}{this }\)
`\(\dfrac{test}{this }\)`
compared to
\(\frac{test}{this }\)
`\(\frac{test}{this }\)`

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## More answers

- hartnn

i can see the first one having bold line

- thomaster

Stange,, the first one is bold here, the second one not
while 1 minute ago it was first normal second bold 0.o

- Loser66

\[\dfrac{dummyme}{dontknowhowtodo}\]\[\frac{needtimetopractice}{nodumbanymore}\]

- hartnn

zoom in your page to see the difference

- Loser66

yup, different . thanks

- Loser66

thank you.

- Loser66

@thomaster after a long time of writing, nothing pops up, why?

- thomaster

I was trying if I could make a bold division bar with normal numerator and denominator :P

- Loser66

\[\huge\dfrac{\frac{aaaaaaa}{bbbbbbbbb}}{\frac{ccccccccccccccc}{ddddddddddddd}}\]
hihihihi.... quite clear, right/

- thomaster

you can make the middle division bar longer by adding some spaces
\(\huge\dfrac{~\dfrac{a}{b}~}{\dfrac{c}{d}}\)

- thomaster

`\(\huge\dfrac{~\dfrac{a}{b}~}{\dfrac{c}{d}}\)`

- Loser66

1~ just a little bit longer, what if I want to make it loooooonger?

- thomaster

\(\huge\dfrac{~~~~~~~\dfrac{a}{b}~~~~~~~}{\dfrac{c}{d}}\)

- hartnn

\(He \quad hi\)
`\(\dfrac{test}{this }\)`
use \quad for longer spaces

- hartnn

`\(He \quad hi\)`

- thomaster

or
`\hspace{20pt}`
you can make the space as long as you want by changing the 20

- Loser66

\[He\hspace{50pt} hi\]yep, gotit

- Loser66

\[\left[\begin{matrix}a & b \\ c & d\end{matrix}\right] *\left[\begin{matrix}a&b\\c&d\end{matrix}\right]=\left[\begin{matrix}-1&0\\0&-1\end{matrix}\right]\]

- Loser66

I practice, hihi

- Loser66

how to make -/+ in order?

- thomaster

\(\Large \pm\) ??

- thomaster

more symbols: http://omega.albany.edu:8008/Symbols.html

- caozeyuan

thanks！ It helps, amistre64 's explanation sucks!

- Loser66

I saw someone posted something and had a code at the middle of the text without taking another line, for example: sin\theta = \frac {1}{5}. but I don't know how to do. When I write, it always jumps into the next line.
Show me, please @e.mccormick

- e.mccormick

Bla bla \(\backslash (\)some latex\) bla bla. That type inline?

- Loser66

e.mccormick is sin\(\theta\) and I got it \(\text {thank you}\)

- e.mccormick

Kk. Have fun!

- Loser66

you too

- Loser66

and how to make it be bold

- e.mccormick

This is where \tfrac{}{} and \dfrac{}{} can also help. \tfrac{}{}, Text Fraction, means to make it small, like inline text, no matter what. \dfrac{}{}, Display fraction, means make it large, like it was a stand alone equation, no matter what.
This line is with \(\frac{1}{2}\) just \frac{}{}
This line is with \(\tfrac{1}{2}\) just \tfrac{}{}
This line is with \(\dfrac{1}{2}\) just \dfrac{}{}
This block is with \[\frac{1}{2}\] just \frac{}{}
This block is with \[\tfrac{1}{2}\] just \tfrac{}{}
This block is with \[\dfrac{1}{2}\] just \dfrac{}{}
Notice that the frac changes if it is inline or in a block, \(\backslash\)[ BLOCK \]. But the dfrac and tfrac do not.

- e.mccormick

Fonts use \mathbb{text}, \mathbf{text}, \mathit{text}, and so on.
http://www.codecogs.com/eqneditor shows them all at the top.

- Loser66

let me practice \(\tfrac{you}{me}\) and \(\dfrac{you}{me}\) how about \(\frac {you}{me}\)

- Loser66

the first and the last are the same, right?

- e.mccormick

The math fonts are for equations, but same ones are there for text. here is why:
\textbf{Some text with spaces}
\(\textbf{Some text with spaces}\)
\mathbf{Some text with spaces}
\(\mathbf{Some text with spaces}\)
See the spaces and what happens to them in math mode?

- Loser66

I can see the difference. b stands for bold?

- e.mccormick

Yes, the first and last are the same. Where the [d|t]frac comes in really handy is when you need to make sure one is a large fraction inside another fraction. Or small, and so on. Large inline with text, so it is clear...

- e.mccormick

BoldFace ITalics BlackBoard RoMan TextwriTer

- e.mccormick

Not all of them are supported, like \textsc fails with MathJax.... SmallCaps.

- Loser66

\(\textbf{get nothing, hehe}\) \(\text{now, get a lot, hihi}\)

- e.mccormick

The link is an editor interface.

- e.mccormick

With the t/d fracs you can do \(\dfrac{d}{dx}\left( \dfrac{\dfrac{\tfrac{\pi}{4}+e^x}{x^e}}{14x^6+12x^3-7i}\right )\) inline and it is still readable.

- caozeyuan

what are you guys talking about, I cannot understand a word!

- e.mccormick

@caozeyuan We are talking about \(\LaTeX\).
@Loser66 Attached is what I was saying about the safety bar was attached wrong.

##### 1 Attachment

- caozeyuan

@e.mccormick so how can I use it in everyday life e.g. when writing an email or a doc. ?

- e.mccormick

\(\LaTeX\) has many editors, which make it great for writing papers, books, and so on. Especially ones with formulas and graphs. In fact, I linked one in another post recently.

- caozeyuan

Tag me Please! I want to get that! is it for free?

- e.mccormick

Near the bottom of this is a PDF with vectors, all done in \(\LaTeX\)
http://openstudy.com/study#/updates/51ed5575e4b00daf471999bb
And here is a bit on using the codes to do posts here.
http://openstudy.com/study#/updates/51d89020e4b041c5c27459bb
The same MathJax plugin can be added to blogs and other sites to do similar things elsewhere.

- e.mccormick

Yes. \(\LaTeX\) is free. For doing papers, I use MiKTeX on Windows as my TeX rendering engine and TeXmaker as my editor. However, to just try it for free you can use one of the online ones.
https://www.writelatex.com/
http://www.codecogs.com/latex/eqneditor.php (Equations only, but makes them into grapics!)
http://www.scribtex.com/
https://www.sharelatex.com/

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