How to express a section of the circle equation For example, x ^ 2 + y ^ 2 = 1, I want to represent the trajectory of a curve in this circle, so the equation of this trajectory is also x ^ 2 + y ^ 2 = 1, but there is a value range, so how to represent this value range?

If we use polar coordinates, we can use angles
If we still use orthogonal rectangular coordinate system, we only need to explain the value range of X and Y respectively

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