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D( x )
25*a^4-(16*b^4) = 0
25*a^4-(16*b^4) = 0
25*a^4-(16*b^4) = 0
25*a^4-16*b^4 = 0
25*a^4-16*b^4 = 0
x należy do R
x belongs to the empty set
(x^4-y^4)/(25*a^4-(16*b^4)) = 0
x belongs to the empty set
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