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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2 = -1080/x // + -1080/x
x^2-(-1080/x) = 0
x^2+1080*x^-1 = 0
x^2+1080*x^-1 = 0
x^-1*(x^3+1080) = 0
1*x^3 = -1080 // : 1
x^3 = -1080
x^3 = -1080 // ^ 1/3
x = -6*5^(1/3)
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x należy do O
x = -6*5^(1/3)
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