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D( x )
((3*x^5)/2)*y^(2/3) <= 0
((3*x^5)/2)*y^(2/3) <= 0
((3*x^5)/2)*y^(2/3) <= 0
((3*x^5)/2)*y^(2/3) = 0
3/2*x^5*y^(2/3) = 0 // : 3/2*y^(2/3)
x^5 = 0
x = 0
x <= 0
(-oo:0) (0:+oo) x - +
x in (0:+oo)
ln(((3*x^5)/2)*y^(2/3)) = 0
ln(((3*x^5)/2)*y^(2/3)) = ln(e^0)
((3*x^5)/2)*y^(2/3) = e^0
((3*x^5)/2)*y^(2/3)-e^0 = 0
3/2*x^5*y^(2/3) = 1 // : 3/2*y^(2/3)
x^5 = 2/3*y^(-2/3)
x^5 = 2/3*y^(-2/3) // ^ 1/5
x = (2/3)^(1/5)*y^(-2/15)
x = (2/3)^(1/5)*y^(-2/15)
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