(х²-4)(х²+4) (х-2)(х+2)(х²+4) (х-2)(х+2)(х²+4)
-------------------------------- = ------------------------ = ------------------------- =
(х⁴+8х²+16) - (4х³+16х) (х²+4)² -4х(х²+4) (х²+4)(х²-4х+4)
(х-2)(х+2)(х²+4) х+2
= ----------------------- = ----------
(х²+4)(х-2)(х-2) х-2