4x ( 4x + 2)(1/4) ( x2 + 1)2 + (1/3)( 4x + 2)(-3/4) (x2 + 1)3 factor
( 4x + 2)(-3/4) ( x2 + 1)2 [ 4x (4x + 2) + (1/3)( (x2 + 1) ] =
( 4x + 2)(-3/4) ( x2 + 1)2 [ 16x2 + 8x + (1/3)x2 + (1/3) ] =
( 4x + 2)(-3/4) ( x2 + 1)2 [ (49/3)x2 + 8x + (1/3) ]
2(-3/4) (2x + 1)(-3/4) ( x2 + 1)2 [ (49/3)x2 + 8x + (1/3) ]