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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
sin(50) = 8/n // - 8/n
sin(50)-(8/n) = 0
sin(50)-8*n^-1 = 0
-8*n^-1 = -sin(50) // : -8
n^-1 = sin(50)/8
-1 < 0
1/(n^1) = sin(50)/8 // * n^1
1 = (sin(50)/8)*n^1 // : sin(50)/8
8*(sin(50))^-1 = n^1
n = 8*(sin(50))^-1
n = 8*(sin(50))^-1
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