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D( x )
x < 0
x < 0
x in <0:+oo)
y = (9*x^4.5)/10+((-4.5)^2)/10+11/5 // - (9*x^4.5)/10+((-4.5)^2)/10+11/5
y-((9*x^4.5)/10)-(((-4.5)^2)/10)-(11/5) = 0
(-9/10)*x^4.5+y+(-1/10)*4.5^2-11/5 = 0
-9/10*x^4.5 = -(y-1/10*4.5^2-11/5) // : -9/10
x^4.5 = -10/9*(11/5-y-(-1/10*4.5^2))
x^4 = (-10/9*(11/5-y-(-1/10*4.5^2)))^(1/0.5) // ^ 1/4
abs(x) = (100/81)^(1/4)*(1/10*4.5^2-y+11/5)^(1/2)
x = (100/81)^(1/4)*(1/10*4.5^2-y+11/5)^(1/2) or x = -((100/81)^(1/4)*(1/10*4.5^2-y+11/5)^(1/2))
x in { (100/81)^(1/4)*(1/10*4.5^2-y+11/5)^(1/2), -((100/81)^(1/4)*(1/10*4.5^2-y+11/5)^(1/2)) }
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