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g(x) = aˣ - a⁻ˣ = aˣ - 1/aˣ
(f(x))² - (g(x))² = (aˣ + 1/aˣ)² - (aˣ - 1/aˣ)²
= (aˣ + 1/aˣ) (aˣ + 1/aˣ) - (aˣ - 1/aˣ) (aˣ - 1/aˣ)
= (a²ˣ + 1 + 1 + 1/a²ˣ) - (a²ˣ -1 -1 + 1/a²ˣ)
= (a²ˣ + 2 + 1/a²ˣ) - (a²ˣ -2 + 1/a²ˣ)
= a²ˣ + 2 + 1/a²ˣ - a²ˣ + 2 - 1/a²ˣ
= 2 + 2
= 4