I'm going to answer this as simply as I can: anything.
That's a tough one; it changes a lot only because I tend to be most passionate about whatever song I have just written or I am in the process of writing. Whatever emotions I'm feeling at a certain time are reflected in the music written then.
I have different favorites within different genres, but my all time favorite is probably a tie between Mac Miller and CSNY.
My favorite equation isn't quite complicated but the beauty in the pattern never ceases to astound me:
(1+2+3+...+n)^2 = (1^3+2^3+3^3+...+n^3)
Another favorite is the formula to calculate the sum of a finite arithmetic series:
Where n is the number of terms, a(1) is the first term of the series, and a(n) is the last term of the series.
The formula itself amazes me less than the story I read in my textbook in which this formula was used by a young math student, Carl Friedrich Gauss, when his teacher punished him by putting him in a corner and telling him to add all of the integers from 1 to 100. In a matter of seconds (and without a developed formula at the time), Gauss responded with 5050. The teacher was dumbfounded, and probably had to add the integers up to 100 just to check his work.
Dedication. I am inspired by people who are passionate about everything they do -- people who are driven to fulfill their goals and disregard any hate and judgement that may come their way.
I'm the girl that has to be doing a million things at once. Some things that have stayed consistent as far as my passions and talents include writing, yoga, and nutritional research.