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D( x )
x^2*y^3*(4*x^4*y^2)^(1/2) < 0
4*x^4*y^2 < 0
x^2*y^3*(4*x^4*y^2)^(1/2) < 0
x^2*y^3*(4*x^4*y^2)^(1/2) < 0
x^2*y^3*(4*x^4*y^2)^(1/2) = 0
2*x^4*y^4 = 0 // : 2*y^4
x^4 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
4*x^4*y^2 < 0
4*x^4*y^2 < 0
4*x^4*y^2 = 0
4*x^4*y^2 = 0 // : 4*y^2
x^4 = 0
x = 0
x < 0
(-oo:0)(0:+oo)x-+
x in <0:+oo)
(x^2*y^3*(4*x^4*y^2)^(1/2))^(1/2) = 0
2^(1/2)*x^2*y^2 = 0 // : 2^(1/2)*y^2
x^2 = 0
x = 0
x = 0
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