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D( x )
((x^10)/25)*y^-8 < 0
((x^10)/25)*y^-8 < 0
((x^10)/25)*y^-8 < 0
((x^10)/25)*y^-8 = 0
1/25*x^10*y^-8 = 0 // : 1/25*y^-8
x^10 = 0
x = 0
x < 0
(-oo:0) (0:+oo) x - +
x in <0:+oo)
(((x^10)/25)*y^-8)^(3/2) = 0
1/125*x^15*y^-12 = 0 // : 1/125*y^-12
x^15 = 0
x = 0
x = 0
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