What is (4t^2-64) -: (t 4)?
(4t² - 64) / (t^4) = 4t²:t^4 - 64:t^4 = 4t^-2 - 64:t^4 = 1/(4t²) - 64/t^4 = mmc 4t² e t^4 = 4t^4t²/4t^4 - 4*64/4t^4 = (t² - 256)/(4t^4)
