I need help to Simplify please!! I would like to see how the answer is achieved step by step please!!!! Thanks in advance

Answer:
1
Step-by-step explanation:
(2/3)² : (1/2)² - 5/9 = .............. (solve the square first)
(2²/3²) : (1²/2²) - 5/9 =
(4/9) : (1/4) - 5/9 = ......(in algebra we do Divide first)
(4/9) x (4/1) - 5/9 =
16/9 - 5/9 =
(16-5)/9 =
9/9 =
1