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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
180/4.32 = 290/n // - 290/n
180/4.32-(290/n) = 0
180/4.32-290*n^-1 = 0
-290*n^-1 = -41.66666667 // : -290
n^-1 = 0.14367816
-1 < 0
1/(n^1) = 0.14367816 // * n^1
1 = 0.14367816*n^1 // : 0.14367816
6.96000004 = n^1
n = 6.96000004
n = 6.96000004
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