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= a^2x + a^-2x + 2
(g(x))² = a^2x + a^-2x - 2.a^x.a^-x
= a^2x + a^-2x - 2
(f(x))² - (g(x))²
= a^2x + a^-2x + 2 - ( a^2x + a^-2x - 2 )
= a^2x + a^-2x + 2 - a^2x - a^-2x + 2
4