Let y = f (x) (x > = 0) be a strictly monotonically increasing continuous function, f (0) = 0, and x = g (y) be its inverse function. It is proved that ∫ (0-A) f (x) DX + ∫ (0-B) g (y) d

Let y = f (x) (x > = 0) be a strictly monotonically increasing continuous function, f (0) = 0, and x = g (y) be its inverse function. It is proved that ∫ (0-A) f (x) DX + ∫ (0-B) g (y) d

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