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D( N )
N^2 = 0
N^2 = 0
N^2 = 0
1*N^2 = 0 // : 1
N^2 = 0
N = 0
N in (-oo:0) U (0:+oo)
201.444 = (37*49)/(N^2) // - (37*49)/(N^2)
201.444-((37*49)/(N^2)) = 0
201.444-1813*N^-2 = 0
-1813*N^-2 = -201.444 // : -1813
N^-2 = 0.11111087
-2 < 0
1/(N^2) = 0.11111087 // * N^2
1 = 0.11111087*N^2 // : 0.11111087
9.00001953 = N^2
N^2 = 9.00001953 // ^ 1/2
abs(N) = 9.00001953^(1/2)
N = 9.00001953^(1/2) or N = -9.00001953^(1/2)
N in { 9.00001953^(1/2), -9.00001953^(1/2) }
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