Calculus was never an issue for me. I could do double-integral calculus in my head clear into my forties. I’ve just gotten rusty since then, likely with a spot of practice I could pull off that party trick again.
No, the only part of math that ever struck fear into my heart was trigonometry. Sin, cos, tan, that kind of stuff. For some reason I have never been able to grok, on a fundamental level, the basics of trig. I understand things on a high/intellectual level, just not on an instinctual level.
Sure. They 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.