re: what math do you use regularly?

You use cosine every day. If I’m doing 80mph in a 70 zone, and the cop is 30deg off from my directional velocity, will I get a ticket? No, cosine of 30 (off the top of my head) is about .85 and the cop would be reading around 70 mph.

Simple addition and subtraction. To dismiss my morning alarm you have to solve a math problem. That way I can't turn it off by mistake.

Linear Programming for optimization

I use trigonometry all the time, Euclidean geometric principles are probably the most practical tied with a few algebraic functions I use often. I'm using a CAS if I'm doing anything involving calculus, definite integrals are not an uncommon occurrence in my work.

2 + 2 = 4. Not 5, 6. Basic Arithmetic

This is a cute thread

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Obtuse1

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Thanks for starting it.

Algebra and geometry. A quirk I have when driving thru a city interstate loop when the exit/mile marker goes from x to 1, is figuring how close I am to downtown using x= 2*pie*r and solving for the radius. Usually results of downtown (typically the center of the loop) are within one mile of the solved radius anywhere on the loop.

I’m a lawyer so I’m pretty good at calculating 1/3

I’m a bass player so I count to four a lot.

im an engineer and I use Excel math