18. Agar f(x) = (x²-1) / x², g(x) = 1/x² bo'lsa, f(g(2)) ni hisoblang.

Разбираемся:

1. Найдем g(2):
   • g(2) = 1 / 2² = 1/4
2. Теперь найдем f(g(2)) = f(1/4):
   • f(1/4) = ((1/4)² - 1) / (1/4)² = (1/16 - 1) / (1/16) = (1 - 16) / 16 * 16 = -15

Ответ: A) -15