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High school mathematics elective course 2- 1 kneel down and ask god to help solve the problem. The answer includes the answer and a clear process.
Let the center of the circle be p, M(x, y).

|OP|? =9,

|PM|? =(x-3)? +y?

|OM|? =x? +y?

∴|OM|? +|PM|? =|OP|?

Substitution solution, the trajectory equation of the point m in the chord AB is: x? +y? -3x = 0( 1 & lt; x = & lt3)