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D( x )
2*x^2+1 = 0
2*x^2+1 = 0
2*x^2+1 = 0
2*x^2 = -1 // : 2
x^2 = -1/2
x in (-oo:+oo)
y = 5/(2*x^2+1) // - 5/(2*x^2+1)
y-(5/(2*x^2+1)) = 0
y-5*(2*x^2+1)^-1 = 0
y-5/(2*x^2+1) = 0
(y*(2*x^2+1))/(2*x^2+1)-5/(2*x^2+1) = 0
y*(2*x^2+1)-5 = 0
2*x^2*y+y-5 = 0
(2*x^2*y+y-5)/(2*x^2+1) = 0
(2*x^2*y+y-5)/(2*x^2+1) = 0 // * 2*x^2+1
2*x^2*y+y-5 = 0
2*x^2*y = -(y-5) // : 2*y
x^2 = (5-y)/(2*y)
x^2 = (5-y)/(2*y) // ^ 1/2
abs(x) = ((5-y)^(1/2))/(2^(1/2)*y^(1/2))
x = ((5-y)^(1/2))/(2^(1/2)*y^(1/2)) or x = -(((5-y)^(1/2))/(2^(1/2)*y^(1/2)))
x in { ((5-y)^(1/2))/(2^(1/2)*y^(1/2)), -(((5-y)^(1/2))/(2^(1/2)*y^(1/2))) }
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