Jika k^2x = 3, maka k^3x - k^-3x / k^5x + k^-5x = ....

k^2x = 3

(k^3x - k^-3x) (k^5x + k^-5x)^-1
= (k^3x - k^-3x) (k^-5x + k^5x)
= k^-2x + k^8x - k^-8x - k^2x
= 1/k^2x + (k^2x)^4 - 1/(k^2x)^4 - k^2x
= 1/3 + 3^4 - 1/3^4 - 3
= 1/3 + 81 - 1/81 - 3
= 26/81 + 78