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D( N )
N = 0
N = 0
N = 0
N in (-oo:0) U (0:+oo)
90 = 360/N // - 360/N
90-(360/N) = 0
90-360*N^-1 = 0
-360*N^-1 = -90 // : -360
N^-1 = 1/4
-1 < 0
1/(N^1) = 1/4 // * N^1
1 = 1/4*N^1 // : 1/4
4 = N^1
N = 4
N = 4
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