thanks you very much for your answer.
But I dont have macintosh, I have windows 10.
I found this video : How to write Maths Equation in Adobe Indesign ... - YouTube
I tried it but it didnt work.
I think becuase I dont have the application,
May be its becuase its Adobe Creative Cloud.
Waiting for your answer.
Yes, to use Math Magic, you would have to purchase it.