How to make this equation?

Hi,

How to make the equation as the attached image?

Thank you. <http://nabble.documentfoundation.org/file/n4122538/eq.png>

​With something like this:

v_{0}=left none {d} over {dt} g left (t,c_{1},c_{2} right ) mline right
none_{t=t_{0}}

​For the record, opening LibreOffice Math directly (instead of inserting a
formula into a document) show a few helpers to write formula (I didn't know
that before now).

The result of the formula in LO is:
​http://i.imgur.com/gYJfMOM.png

You can probably adjust things more by changing fonts and spacing.

Hi,

v_{0}=left none {d} over {dt} g left (t,c_{1},c_{2} right ) mline right
none_{t=t_{0}}

This looks same and is even a bit shorter:

  v_0 = left none d over dt g left (t,c_1,c_2 right ) right
  rline_{t=t_0}

{}-brackets are one required for longer expressions.

Regards
Karl