Question 279695
(x^-4+6x^-8)/1-36x^-8
(1/x^4 +6/x^8) / 1-36/x^8

(x^4+6 / x^8 ) / (x^8-36) /x^8

(x^4+6)/x^8 * x^8/(x^8-36)

(x^4 +6)/(x^8-36)

(x^4+6) / (x^4+6)(x^4-6)

1/(x^4-6)