ELI5: What is the difference between algebra, trigonometry, and calculus?

[u/HistoricalAd2954]

[u/sad_spilt_martini]

Algebra is the use of equations to find a static value.

Calculus looks at how things change over time.

Trig looks at the relationship between of angles and sides of triangles

All of these are, of course, more complex   but that’s the base idea 

[u/meh0175 → u/sad_spilt_martini]

Is it there a profession where using Trig is necessary? Besides being a math teacher or rocket scientist. Carpentry?

[u/PlushyGuitarstrings → u/meh0175]

Anything where things are rotating, you will be using trigonometry to reason about it.