深入审视一个恒等式
前文推导了一个恒等式，并指出当 x > 1 且 y > 1 时该式成立。现在用 Mathematica 绘制图形来验证，观察恒等式成立时图形的平坦区域。结果确实在 x > 1 区间内保持平坦，这也解释了为何需要强调其适用范围。
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