Separable differential equations

<img width="1159" alt="Image" src="https://github.com/user-attachments/assets/046fe469-b5f7-4495-b8b2-016bb4b76dd9" />

The 3 in the denominator of the second line should be a "y"

See [separableDifferentialEquations/digInSeparableDifferentialEquations.tex](https://github.com/mooculus/calculus/blob/master/separableDifferentialEquations/digInSeparableDifferentialEquations.tex)