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like acos, except returns degrees, a domain of -Infinity to Infinity, and a range of 0 to 360
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| function f(x) { | |
| x = ((((x + 2) % 4) + 4) % 4) - 2 | |
| if(x > 1) return 360 - Math.acos(2 - x) * (180/Math.PI) | |
| if(x < -1) return 360 - Math.acos(-2 - x) * (180/Math.PI) | |
| return Math.acos(x) * (180/Math.PI) | |
| } |
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