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D( x )
x^24*y^4 < 0
x^24*y^4 < 0
x^24*y^4 < 0
x^24*y^4 = 0
x^24*y^4 = 0 // : y^4
x^24 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(x^24*y^4)^(1/4) = 0
x^6*y = 0 // : y
x^6 = 0
x = 0
x = 0
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