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Searches related to solve:(-2x)(x^2+1)^2-(1-x^2)(4x^3+4x)/(x^2+1)^4

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1 Answer

 -2X ( X2 +1 ) 2 - ( 1- X2 )(4 X3 + 4X) / ( X+ 1)4  =0
  
     - 2X ( X2 + 1 )2 - 4X( 1 - X2)( X2 + 1 )/ ( X+ 1 ) 4 =0
 
       -2X ( X2 + 1 ) [ X2 + 1- 2( 1 - X2 ) ] / ( X2 + 1) 4 = 0
 
       - 2X ( 3X2 - 1 ) / ( X2 + 1 )3 = 0
 
         X = 0.   3X2 - 1 = 0     X = ±√1/3