1 -------- 2 (x - 2)
1/((x - 2)^2)
(-2 + x)^(-2)
1 --------- 2 (-2 + x)
0.25/(-1 + 0.5*x)^2
1 ------------ 2 4 + x - 4*x
1/(4 + x^2 - 4*x)