10.30.3 Can you answer these questions?

10.30.3.1 Can't compile a standalone app in 14.1
10.30.3.2 How to generate lensed light animations like this?
10.30.3.3 Why is the solution to a harmonic equation split into two classes when one class suffices?
10.30.3.1 Can't compile a standalone app in 14.1

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=306842

I read the article reviewing the innovations in version 14.1 and am absolutely thrilled to be able to build a standalone app. I tried to replicate the example from the article in an even shorter form, ... 
[compile] [version-14.1] [c]
 
asked by Kirill Belov https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=38236 Score of 2
10.30.3.2 How to generate lensed light animations like this?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=306835

How can one generate the projection simulation effect in the following video (from Apple's webpage (minus the logo of course)). 
I would like to be able to create a similar-looking shader animation in ... 
[graphics] [animation] [visualization] [shader]
 
asked by M.R. https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=403 Score of 2
10.30.3.3 Why is the solution to a harmonic equation split into two classes when one class suffices?

https://mathematica.stackexchange.com/landing/r/digest?cta=question&id=306791

If we solve $\sin(x) = 0$, we arrive at $$x = n \pi, n \in \mathbb{Z}$$ 
When I do (Reduce also returns the same) 
   Solve[Sin[x] == 0, {x}, Reals] 
 
The result is 
$$\{... 
[equation-solving] [functions]
 
asked by Moo https://mathematica.stackexchange.com/landing/r/digest?cta=user&id=36141 Score of 1