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Trigonometry
(thelemmy.club)
[Harold leaning back in his chair: Day 1209 of not using sin, cos or tan.]
I've been clean since 2002.
If I'm gonna build stuff I at LEAST need my 3-4-5 triangle. Pythagoras sends his regards!
I did use trig at work a few months back to calculate some mechanical weirdness of our product that I do the embedded software for, though.