According to an anon on /mlp/:  
It’s the solution for time-independent retarded potentials of charge distributions. It took me a while to recognize it because they’re using vector spherical harmonics in place of partial differential equations. They basically used longhand notation instead of shorthand to fill the board. No scientist worth his salt would do it that way, you’d solve it much quicker with basic vector calc than linear algebra.
 
https://scientificsentence.net/Electromagnetics/index.php?key=yes&Integer=Retarded  
https://en.wikipedia.org/wiki/Retarded_potential

@Background Pony #2938  
Well, in several episodes back, she got an A+ in a test, same as Sunset and Rarity (Sci-Twi got A++).

Fluttershy must be solving a columb’s law equation

i think fluttershy is the smartest of all

If Fluttershy is smart.  
Then that makes Rainbow SMRT?

@Samekh  
I thought they were just freshmen.
 
That or it’s like a combined junior-senior high.

@LegatusFlagrans  
Why matter when there are 10 year old children (the CMC) in a high school?

Is…  
Is that a Gauss’ Law problem?
 
Why are they teaching electrostatics in high school?!

Is Fluttershy now Jason Schwartzman as Max Fischer?

After she got serious, she whent back to being adorable 😆

@ImperfectXIII  
Well that’s boring.

@DarkSpeed  
No, she studied.

@Konata Izumi Pony  
A little birdie told her. (Guessing from the title tag, I haven’t seen it yet).

Calculus with Fluttershy.

@ImperfectXIII  
Sounds lazy, IMO.

@InfiniteDays  
I remember either Katrina Hadley or Ishi Rudell saying they don’t think about what year the girls are in so as not to constrain their story possibilities.

I watch the main show and overall, I think it’s pretty good in setting up a good/fluid continuity. However, I’m little lost on EQG placements. I know the series mentioned they had finals but in latest short with Fluttershy and Trixie, they are in class again with a test. So what’s the timeline continuity of this? Does it seem they are seniors or juniors?

How did she knew that?

I swear… she’s an alien.

@PonyPon  
More fan works, mostly.

@MezzoDragon  
What the hell does that even mean at this point?

@Background Pony #8855  
It’s always the quiet ones.

Fluttershy was the one who got Chemistry and Spelling in the Friendship Games and now she’s apparently pretty sharp in math. Does anyone else get the impression that she might actually be smarter than Sunset and Sci-Twi (both of whom regularly do incredibly stupid things) in this universe?

now this medic of the tf2,this love birds and is a nerd.

Oh, Fluttershy. You and your fancy mathematics.