I am not the most math-affine person, but passable. What breaks me every time is greek letters in formulas, or one letter in both cases(upper/lower). I cannot seem to remember even the most basic formulas if they contain greek characters (an exception being alpha, beta, delta, pi, epsilon and gamma, perhaps because i learned these at a younger age). I can read and write them all, but formulas containing them won't stick and are much harder to understand/work with 'at a glance'. Lower case char vs. same char in upper case also trips me up, as the case info tends to vanish from my recollection.
As the latin alphabet contains more than enough characters to tackle most questions, i surmise that greek characters are in use because that way you can express more things simultaneously without overlapping meaning. However that pro for me pales in light of the con that i cannot recall the formulas.
Rewriting formulas did the trick, but i am still holding out hope that i am not alone with this affliction, and that there is ready-made literature out there that caters to my inability. I did not know whether to post this here or in the Physics stack (Thermodynamics lit is driving me up the walls) but my guess was that there is some overlap in readership anyways.
Tldr: I'm looking for university level (though introductory) Calculus and Thermodynamics literature with one-case, no-greek character set in English or German; or equivalent literature that has the ideas contained in the formulas spelled out long-form (e.g. 'The sine of the difference of the temperature ..')
Edit: To quote Paul Sinclair, from his answer below: " The Law of Sines that Hagen von Eitzen quotes is not "$\frac a{\sin A} = \frac b{\sin B} = \frac c{\sin C}$". But rather that "in a triangle, the ratio of a side to the sine of its opposing angle is the same for all three sides" " - My problem is not that i try and memorize ' lower case a divided by the sine of upper case A ... ' but that i cannot, at a glance, divine the meaning of that formula, and neither can i recreate that formula (actually it's a bad example, because i am, as stated, ok with the use of alpha, beta and gamma, probably because i learned them in some formative phase in school; So those could have been used here and made the formula better for me, as it would have done away with the upper case characters...).
I am aware that greek, fat, cursive, etc. are a great help to many others out there, and that there can be meaning encoded, etc. . I'd just like a text book that either has formulas completely rendered as the ideas they represent, or as formulas in one-case only Latin. Please refrain from 'walk it off'-comments and 'that's math, man'-comments. I walked it off, got a degree, am functional. I'd just like to read maths literature, for fun, without having to rewrite and annotate every single formula.