9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 9
- x + 9*x - 2*x + 8*x - 3*x + 7*x - 4*x + 6*x - 5*x + 5*x - 6*x + 4*x - 7*x + 3*x - 8*x + 2*x 10*x
----------- + ------------- + ------------- + ------------- + ------------- + ------------- + ------------- + ------------ + ---------
9 8 7 6 5 4 3 2 10
(1 - x) (1 - x) (1 - x) (1 - x) (1 - x) (1 - x) (1 - x) (1 - x) (1 - x)
$$\frac{10 x^{9}}{\left(1 - x\right)^{10}} + \frac{- 8 x^{2} + 2 x}{\left(1 - x\right)^{2}} + \frac{- 7 x^{3} + 3 x^{2}}{\left(1 - x\right)^{3}} + \frac{- 6 x^{4} + 4 x^{3}}{\left(1 - x\right)^{4}} + \frac{- 5 x^{5} + 5 x^{4}}{\left(1 - x\right)^{5}} + \frac{- 4 x^{6} + 6 x^{5}}{\left(1 - x\right)^{6}} + \frac{- 3 x^{7} + 7 x^{6}}{\left(1 - x\right)^{7}} + \frac{- 2 x^{8} + 8 x^{7}}{\left(1 - x\right)^{8}} + \frac{- x^{9} + 9 x^{8}}{\left(1 - x\right)^{9}}$$
(-x^9 + 9*x^8)/(1 - x)^9 + (-2*x^8 + 8*x^7)/(1 - x)^8 + (-3*x^7 + 7*x^6)/(1 - x)^7 + (-4*x^6 + 6*x^5)/(1 - x)^6 + (-5*x^5 + 5*x^4)/(1 - x)^5 + (-6*x^4 + 4*x^3)/(1 - x)^4 + (-7*x^3 + 3*x^2)/(1 - x)^3 + (-8*x^2 + 2*x)/(1 - x)^2 + 10*x^9/(1 - x)^10