I wrote one for you. Apply the following patch and it should be ok.
But like I said before, I breqn hangs on "integrate(sqrt(x^2+1)/(x^4+1),
x)".
"(x+y+z)^10" works fine for me.
--- fricas.el
+++ fricas.el
@@ -165,4 +165,5 @@
(defvar fricas-TeX-preamble (concat "\\documentclass{article}"
"\\usepackage[active,dvips,tightpage,displaymath]{preview}"
+ "\\usepackage{breqn}"
"\\begin{document}"
"\\begin{preview}"))
@@ -1215,6 +1216,16 @@
(inhibit-read-only t))
+ (setq fricas-TeX-buffer-2 fricas-TeX-buffer)
(write-region (concat fricas-TeX-preamble
- fricas-TeX-buffer
+ (with-temp-buffer
+ (insert fricas-TeX-buffer-2)
+ (search-backward "$$")
+ (replace-match "\\end{dmath*}" t t)
+ (search-backward-regexp "\n\\\\leqno.*$")
+ (replace-match "")
+ (goto-char (point-min))
+ (search-forward "$$")
+ (replace-match "\\begin{dmath*}" t t)
+ (buffer-string))
fricas-TeX-postamble)
nil fricas-TeX-file)
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