Besides the format options in the toolbar when editing an issue,
Latex:
<img src="https://render.githubusercontent.com/render/math?math=\frac{\mathrm d }{\mathrm d t}\left({\frac{\partial\mathcal{L}}{\partial\dot{q}_i }}\right)-\frac{\partial \mathcal{L}}{\partial q_i }=Q_{NCi}\quad i=1,\dotsc,N">
...
Image (drag and drop image file here but use html code to set its size):
Besides the format options in the toolbar when editing an issue, Latex:
<img src="https://render.githubusercontent.com/render/math?math=\frac{\mathrm d }{\mathrm d t}\left({\frac{\partial\mathcal{L}}{\partial\dot{q}_i }}\right)-\frac{\partial \mathcal{L}}{\partial q_i }=Q_{NCi}\quad i=1,\dotsc,N">... Image (drag and drop image file here but use html code to set its size):<img src="https://user-images.githubusercontent.com/3271581/76967836-b1af5700-6906-11ea-8a26-ef2c89ca1460.png" height="100" >...