Take the tour ×  I have got the following TeX equation:
\[r(t)=\frac{l}{1+e\cos \theta (t)}\]  Now I could not use this
in Texmaker. To show the same equation Texmaker wants  $ r(t )=
\dfrac{l}{ 1+e cos \theta (t)} $\\  So what should I do?
share|improve this question Welcome to TeX.sx! A 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). –  Corentin Nov 15 '12 at 13:35 I am not sure
I understand your problem: the first equation should compile
fine. You should remove the \` in the second equation, and use
\cos` also here. Could you please provide a minimal working
example (MWE) that illustrates your problem, including your
preamble (\dfrac is defined in the amsmath package). –  Corentin
Nov 15 '12 at 13:38 add comment  1 Answer  The following
compiles perfectly in Texmaker:    This yields:  enter image
description here  share|improve this answer add comment  Your
Answer