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Please how can I write this equation in latex?

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    What have you tried? Which part do you have trouble with? This is simply fraction and left right delimiter
    – Alain Remillard
    Oct 13, 2015 at 16:42

2 Answers 2

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Is it difficult?

\documentclass{article}
\usepackage{amsmath}

\begin{document}
\[
 B_{v} = \frac{\mu_{0}I_{p}}{4\pi R}\biggl[\ln\biggl(\frac{8R}{a}\biggr) - \frac{3}{2} + \beta_{p} + \frac{l_{i}}{2}\biggr]
\]
\end{document}

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    I guess it is difficult for the OP. Otherwise he wouldn't ask for help.
    – Gonzalo Medina
    Oct 13, 2015 at 16:52
  • @GonzaloMedina: I understood. :). That is why I answered. May be that phrase should be changed.. :)
    – user11232
    Oct 13, 2015 at 16:54
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\begin{equation*}
B_v = \dfrac{\mu_0 I_p}{4 \pi R} \left[ \ln \left( \dfrac{8 R}{a} \right) -dfrac{3}{2} + \beta_p + \dfrac{l_i}{2}\right]
\end{equation*}
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