- Press "x-" or "x+" so that x approaches 2 in order to compare the ratio of f(x) and g(x).
- If the value of f(x) and g(x) are too small, press "Zoom in".
- If you press "Zoom in" more and more, the curves of f(x) and g(x) look straight.
- The staraight lines are almost close to tangent lines of f(x) and g(x) at x=2.
- When x approaches 2, the ratio of f(x) and g(x) is equal to the ratio of slopes of two tangent lines.
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