CASIO calculators say 1, and I think it's more intuitive with "÷2π" being equivalent to "÷(2×π)" rather than "÷2×π". It took me a while to figure out why my results were almost but not quite one order of magnitude wrong after I was forced to switch to TI. Obviously nobody in high school or uni wrote ÷ (or Czech :) on paper, it was all fractions, but even on "natural mode" calculators I'd use the ÷ key for simple denominators to save vertical space.