Inequality comparison in Senior High School It is known that 1 < a < 2, X ≥ 1, f (x) = a ^ x + A ^ (- x) / 2, G (x) = 2 ^ x + 2 ^ (- x) / 2 Compare the size of F (x) and G (x) Can you explain it? It's very difficult

Inequality comparison in Senior High School It is known that 1 < a < 2, X ≥ 1, f (x) = a ^ x + A ^ (- x) / 2, G (x) = 2 ^ x + 2 ^ (- x) / 2 Compare the size of F (x) and G (x) Can you explain it? It's very difficult

It's not hard to see