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f=\(a,b,c,d)atan2(d-b,c-a)/pi*180
\(a,b,c,d)atan2(d-b,c-a)/pi*180
A built-in atan2 function.
atan2
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result:
> f(5,5,5,-5) [1] -90 > f(5,-5,5,5) [1] 90
