Loser66 2 years ago new one

1. 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)=....

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)=....

3. hartnn

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

4. hartnn

i can see the first one having bold line

5. thomaster

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

6. Loser66

$\dfrac{dummyme}{dontknowhowtodo}$$\frac{needtimetopractice}{nodumbanymore}$

7. hartnn

zoom in your page to see the difference

8. Loser66

yup, different . thanks

9. Loser66

thank you.

10. Loser66

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

11. thomaster

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

12. Loser66

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

13. thomaster

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

14. thomaster

$$\huge\dfrac{~\dfrac{a}{b}~}{\dfrac{c}{d}}$$

15. Loser66

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

16. thomaster

$$\huge\dfrac{~~~~~~~\dfrac{a}{b}~~~~~~~}{\dfrac{c}{d}}$$

17. hartnn

$$He \quad hi$$ $$\dfrac{test}{this }$$ use \quad for longer spaces

18. hartnn

$$He \quad hi$$

19. thomaster

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

20. Loser66

$He\hspace{50pt} hi$yep, gotit

21. Loser66

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

22. Loser66

I practice, hihi

23. Loser66

how to make -/+ in order?

24. thomaster

$$\Large \pm$$ ??

25. thomaster

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

26. caozeyuan

thanks！ It helps, amistre64 's explanation sucks!

27. 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

28. e.mccormick

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

29. Loser66

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

30. e.mccormick

Kk. Have fun!

31. Loser66

you too

32. Loser66

and how to make it be bold

33. 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.

34. e.mccormick

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

35. Loser66

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

36. Loser66

the first and the last are the same, right?

37. 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?

38. Loser66

I can see the difference. b stands for bold?

39. 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...

40. e.mccormick

BoldFace ITalics BlackBoard RoMan TextwriTer

41. e.mccormick

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

42. Loser66

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

43. e.mccormick

The link is an editor interface.

44. 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.

45. caozeyuan

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

46. e.mccormick

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

47. caozeyuan

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

48. 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.

49. caozeyuan

50. 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.

51. 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/