The tangent to the hyperbola xy = c2 at the point P intersects the x-axis at T and the y-axis at T1. The normal to the hyperbola at P intersects the x-axis at N and the y-axis at N1. The areas of the triangles PNT and PN'T' are delta 1 and delta' respectively, then ' 1 /delta+1/delta1=
The tangent to the hyperbola xy = c2 at the point P intersects the x-axis at T and the y-axis at T1. The normal to the hyperbola at P intersects the x-axis at N and the y-axis at N1. The areas of the triangles PNT and PN'T' are delta 1 and delta' respectively, then ' 1 /delta+1/delta1=