Is it better to add a transcript of a non-completed degree for a master's degree admission?
Many universities will demand a full transcript of your academic history, so, in that case, you will need to attach both (or a combined) transcript(s) to your application.

Even if they only ask for the transcript of your main studies, you might want to attach the transcript for the math lectures and exercises. Especially in this case, where math acts perfectly as a supporting discipline for a phyiscs major.