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g(2x) = a^2x - a^-(2x)
g(2x) - f(x) × g(x)
= [a^2x - a^-2x] - [a^x + a^-x] × [a^x - a^-x]
= [a - a^-2x] - [(a^x × a^x) - (a^x × a^-x) + (a^-x × a^x) - (a^-x × a^-x))]
= [a^2x - a^-2x] - [a^2x - a^0 + a^0 - a^-2x]
= (a^2x - a^-2x) - (a^2x - a^-2x)
= (a^2x - a^2x) + (-a^-2x - (-a^2x))
= 0 + 0
= 0