((3x^2)(x^2+1)-(2x)(x^3))/((x^2+1)^2)=0

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Solution for ((3x^2)(x^2+1)-(2x)(x^3))/((x^2+1)^2)=0 equation: 


D( x )

(x^2+1)^2 = 0

(x^2+1)^2 = 0

(x^2+1)^2 = 0

1*x^2 = -1 // : 1

x^2 = -1

x in (-oo:+oo)

(3*x^2*(x^2+1)-(2*x*x^3))/((x^2+1)^2) = 0

(3*x^2*(x^2+1)-2*x^4)/((x^2+1)^2) = 0

3*x^2*(x^2+1)-2*x^4 = 0

3*x^2*(x^2+1)-2*x^4 = 0

x^4+3*x^2 = 0

x^4+3*x^2 = 0

x^2*(x^2+3) = 0

1*x^2 = -3 // : 1

x^2 = -3

x^2 = 0

x^2 = 0

(x^2)/((x^2+1)^2) = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

x = 0

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