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D( n )
2*6^n*3^n = 0
2*6^n*3^n = 0
2*6^n*3^n = 0
2*6^n = 0
6^n = 0
n należy do O
2*6^n = 0 <=> 2 = 0 or 2*6^n = 0 <=> 6^n = 0
3^n = 0
n należy do O
2*6^n*3^n = 0 <=> 2*6^n = 0 or 2*6^n*3^n = 0 <=> 3^n = 0
n in (-oo:+oo)
(4*18^n)/(2*6^n*3^n) = 0
(4*18^n)/(2*6^n*3^n) = 0 // * 2*6^n*3^n
4*18^n = 0
18^n = 0
n należy do O
4*18^n = 0 <=> 4 = 0 or 4*18^n = 0 <=> 18^n = 0
n belongs to the empty set
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