Please explain how to solve the following...I am getting stuck and not sure how to proceed:

Differentiate each function. Express your answer in a simplified factored form:

f) y = (2x - 1)² / (x - 2)³

g) y = x⁴(1-4x²)³

h) y = ((x² - 3)/(x² + 3))⁴

i) y = (x² + 3)³(x³ + 3)²

j) h(x) = x/(1 + x²)

k) s = (4 - 3t³)⁴(1 - 2t)⁶

l) h(x) = (1 - x²)/1 - x