kpreid comments on Stupid Questions February 2015 - Less Wrong
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Comments (198)
I'd like to put in a word for sine:
These are highly useful properties in some contexts. That said, cos(0) being the unit prior to any rotation is also nice. (But the definition of a rotation in Cartesian coordinates contains exactly as many sines as cosines; and that generalizes to 3 dimensions where complex numbers do not.)