Given the coordinates (1,2 times the root sign 3) of the endpoint B of the line segment AB, the endpoint a moves on the circle P (x + 1) ^ 2 + y ^ 2 = 4, find the tangent equation of the trajectory of the midpoint m in AB and P passing through point B

Given the coordinates (1,2 times the root sign 3) of the endpoint B of the line segment AB, the endpoint a moves on the circle P (x + 1) ^ 2 + y ^ 2 = 4, find the tangent equation of the trajectory of the midpoint m in AB and P passing through point B

Let the coordinates of M be (x, y), then the coordinates of B be (2x-1,2y-2 times the root sign 3). B is on the circle. If B is simplified, the trajectory equation of the end point m can be obtained, which should be a circle. Let the tangent equation be Y-2 times the root sign 3 = K (x-1). If B is simplified with the equation of the circle, a quadratic equation of one variable can be obtained