若角的终边经过点,则的值为______________.
若圆x2+y2-2ax+a2=2和x2+y2-2by+b2=1外离,则a,b满足的条件是
已知两圆C: x+y+4x-2ny+n-5=0,则C: x+y-2nx+2y+n-3="0," C与C外离时n的范围是_____,与内含时n的范围是______
圆C:x+y-6x+8y=0与x+y+b=0没有公共点,则b的取值范围是_____
直线L过点(-5,-10),且在圆x+y=25上截得的弦长为5,则直线L的方程为_______
由点P(1,-2)向圆x2+y2-6x-2y+6=0引切线方程是