Take the 2-minute tour ×
TeX - LaTeX Stack Exchange is a question and answer site for users of TeX, LaTeX, ConTeXt, and related typesetting systems. It's 100% free, no registration required.

I am using the breqn package, but it is not working.

\begin{dmath}

\sqrt {-{\frac {-4\,c-k_{{2}}{x}^{2}+{x}^{2}\sqrt {4\,c+{k_{{2}}}^{2}}}{c}}}\sqrt {{\frac {4\,c+k_{{2}}{x}^{2}+{x}^{2}\sqrt {4\,c+{k_{{2}}}^{2}}}{c}}}{\it EllipticF} \left( 1/2\,x\sqrt {{\frac {-k_{{2}}+ \sqrt {
4\,c+{k_{{2}}}^{2}}}{c}}},1/2\,\sqrt {-{\frac {4\,c+2\,{k_{{2}}}^{2}+2\,k_{{2}}\sqrt {4\,c+{k_{{2}}}^{2}}}{c}}} \right) {\frac {1}{\sqrt {{\frac {-k_{{2}}+\sqrt {4\,c+{k_{{2}}}^{2}}}{c}}}}}{\frac {1}{\sqrt {8\,c-2\,{x}^{4}+4\,k_{{2}}{x}^{2}}}}=t
\end{dmath}
share|improve this question
    
Welcome to TeX.sx! Please add a minimal working example (MWE) that illustrates your problem. It is considered a lot better to put in some code that will compile, as it makes it a lot easier for us to copy it into our text editor and work with it, and see exactly what it is you are trying to do. –  Andrew Uzzell Nov 1 '12 at 10:25
    
Another tip: If you indent lines by 4 spaces, they'll be marked as a code sample. You can also highlight the code and click the "code" button (with "{}" on it). –  Andrew Uzzell Nov 1 '12 at 10:26
add comment

2 Answers

Examining your math expression, I can't see how it might be typeset across just two lines; at a minimum, three lines are required to typeset it properly. The following MWE does so, using the multline environment provided by the amsmath package.

\documentclass{article}
\usepackage{amsmath}
\begin{document}\pagestyle{empty}
\begin{multline*}
\sqrt {-\frac {-4c-k_2x^2+x^2\sqrt {4c+k_2^2}}{c}}\,
\sqrt {\frac {4c+k_2x^2+x^2\sqrt {4c+k_2^2}}{c}}\\
\times \textit{EllipticF} 
\left( \frac{1}{2}x\sqrt {\frac {-k_2+ \sqrt {4c+k_2^2}}{c}},
\frac{1}{2}\sqrt {-\frac {4c+2k_2^2+2k_2\sqrt {4c+k_2^2}}{c}} \,\right) \\
\times \frac {1}{\sqrt \frac{-k_2+\sqrt {4c+k_2^2}}{c}}\,
\frac {1}{\sqrt {8c-2x^4+4k_2x^2}}=t
\end{multline*}
\end{document}

enter image description here

share|improve this answer
1  
To get the equation number (as in the original formula), use multline. I've come to a very similar input, removing the useless braces and many \, commands, adding the same as you did. :) However, I'm not very convinced about \times; perhaps \cdot? –  egreg Nov 1 '12 at 11:32
    
@egreg - \times may indeed be a bit too prominent, visually speaking. If so, \cdot would certainly be a plausible alternative. At any rate, it would seem to be a good idea to make explicit that the items across the three lines are being multiplied together, using any multiplication symbol that does the job. –  Mico Nov 1 '12 at 11:52
add comment

Taking @Mico's answer and removing the forced \\ breaks and going back to breqn you will see that breqn can break this although I couldn't see a way to get the indentation, so th emanual breaking is giving more pleasing appearance here, but sometimes manual breaking isn't really an option and breqn is what you want...

enter image description here

\documentclass{article}
\usepackage{breqn}
\begin{document}\pagestyle{empty}
\begin{dmath*}
\sqrt {-\frac {-4c-k_2x^2+x^2\sqrt {4c+k_2^2}}{c}}
\sqrt {\frac {4c+k_2x^2+x^2\sqrt {4c+k_2^2}}{c}}
\times \textit{EllipticF} 
\left( \frac{1}{2}x\sqrt {\frac {-k_2+ \sqrt {4c+k_2^2}}{c}},
\frac{1}{2}\sqrt {-\frac {4c+2k_2^2+2k_2\sqrt {4c+k_2^2}}{c}} \,\right)
\times \frac {1}{\sqrt \frac{-k_2+\sqrt {4c+k_2^2}}{c}}
\frac {1}{\sqrt {8c-2x^4+4k_2x^2}}=t
\end{dmath*}
\end{document}
share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.