
Grade 11IIT JEE Entrance Exam
If the normals at 4 points x1,y1 x2,y2 x3,y3 and x4,y4 on same ellipse are concurrent. Find the value of (x1+x2+x3+x4)(1/x1+1/x2+1/x3+1/x4).
If the normals at 4 points x1,y1 x2,y2 x3,y3 and x4,y4 on same ellipse are concurrent. Find the value of (x1+x2+x3+x4)(1/x1+1/x2+1/x3+1/x4).



