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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)