\frac{ 3 { \left(x+1 \right) }^{ 2 } ( { x }^{ 2 } +1)(x-1)- { \left(x+1 \right) }^{ 3 } (3 { x }^{ 2 } -2x+1 }{ ( { x }^{ 2 } +1)( { x }^{ 2 } +1) { \left( { x }^{ 2 } -1 \right) }^{ 2 } }
Evaluate
\frac{\left(x+1\right)\left(3x^{10}-6x^{9}+9x^{8}-12x^{7}+6x^{6}-6x^{4}+12x^{3}-12x^{2}+8x-4\right)}{\left(\left(x-1\right)\left(x^{2}+1\right)\right)^{2}}
Expand
\frac{3x^{11}-3x^{10}+3x^{9}-3x^{8}-6x^{7}+6x^{6}-6x^{5}+6x^{4}-4x^{2}+4x-4}{\left(\left(x-1\right)\left(x^{2}+1\right)\right)^{2}}
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