It’s all triangles.

Sure. The relate different properties of triangles or periodic phenomena.

But can you explain what a “sine” operation is actually doing? Algebra and calculus can pretty much all be explained in terms of basic operations like addition, subtraction, multiplication, and division. But. I’m in the same boat as @rekabis@lemmy.ca - trig operations feel like a black box where one number goes in and a different number comes out. I am comfortable using them and understand their patterns, but don’t really get them.