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D( x )
x^4+27 = 0
x^4+27 = 0
x^4+27 = 0
1*x^4 = -27 // : 1
x^4 = -27
x in (-oo:+oo)
0 = (4*x^3)/(x^4+27) // - (4*x^3)/(x^4+27)
0-((4*x^3)/(x^4+27)) = 0
-4*x^3*(x^4+27)^-1 = 0
(-4*x^3)/(x^4+27) = 0
-4*x^3 = 0 // : -4
x^3 = 0
x = 0
x = 0
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