((r^2+1)-2r^2)/(r^2+1)^2=0

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


D( r )

(r^2+1)^2 = 0

(r^2+1)^2 = 0

(r^2+1)^2 = 0

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

r^2 = -1

r in (-oo:+oo)

(r^2-(2*r^2)+1)/((r^2+1)^2) = 0

(r^2-2*r^2+1)/((r^2+1)^2) = 0

(1-r^2)/((r^2+1)^2) = 0

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

r^2 = 1

r^2 = 1 // ^ 1/2

abs(r) = 1

r = 1 or r = -1

r in { 1, -1 }

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