1. From the driven point P to the circle X? +y？ = 1 leads to two tangents PA and PB, and the tangents are a,

B, ∠ APB = 60, then the trajectory equation of the moving point P is.

2. The equation of the circle whose center is on the straight line y=x and tangent to the X axis at the point (1, 0) is _ _ _ _ _ _ _ _.

3. If the center of the circle is on the X axis, the circle O with radius 2 is located on the left side of the Y axis and parallel to the straight line x+y? =0 tangent, then the equation of circle O is.

4 It is known that circle C is tangent to straight lines X-Y = 0 and X-Y-4 = 0, and the center of circle is on straight line x+y=0, then the equation of circle C is.

5. Given two fixed points A (2,0) and B( 1 0), if the fixed point P satisfies │PA│=2│PB│, the area of the graph surrounded by the locus of point P is equal to.

6. cycle O 1: x? +y？ -2x=0, circle O2: x? +y？ The positional relationship of -4y=0 is

(a) separate (b) intersect (c) circumscribe (d) inscribe

7. Straight line √3x-y +m=0 and circle x? +y？ -2x-2=0 tangent, then the real number m is equal to ().

8. straight line l and circle x? +y？ +2x-4y+a=0 intersects at points A and B, and the midpoint of chord AB is (0, 1), then the equation of straight line L is.

9. If the straight line x/a+y/b= 1 passes through point M(cosα, sinα), then ().

Alcoholics Association. +b？ ≤ 1? Bachelor of arts? +b？ ≥ 1 C. 1/a？ + 1/b？ ≤ 1 D. 1/a？ + 1/b？ ≥ 1