2 1 13 - d 1*--- + ------- 10 12 d d
1/d^10 + (13 - d^2)/(d^12)
2 1 13 - d --- + ------- 10 12 d d
d^(-10) + (13 - d^2)/d^12
2 1 13 - d --- + ------- 10 12 d d
d^(-10) + (13 - d^2)/d^12
13 --- 12 d
12 10 / 2\ d + d *\13 - d / ------------------- 22 d
(d^12 + d^10*(13 - d^2))/d^22