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Polar coordinates and parametric equations in high school mathematics
In fact, it is to find the line segment length MN.

Obviously, when m and n coincide, |MN|=0, and when MN is parallel to the X axis, |MN|max=2.

Intuitively, curve C2 is a circle, and the longest of all its chords is the diameter.

Therefore, 0≤|MN|≤2.

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