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This is that Pre Cal so i dont think you ready
Y^2=N^2+S^2-2(N)(S)cos(Y)
cos(Y)=N^2+S^2-Y^2/2(N)(S)
(sin(Y)/y)=(sin(N)/n)=(sin(S)/s)
Y^2=N^2+S^2-2(N)(S)cos(Y)
cos(Y)=N^2+S^2-Y^2/2(N)(S)
(sin(Y)/y)=(sin(N)/n)=(sin(S)/s)