Equation of tangent to ellipse at given point is x(
1
√2
)+2y(
1
2
)=1 ⇒ x+√2y=√2 ....(i)
Now, QR is chord of contact of circle x2+y2=1 with respect to point T(h,K) then, QR≡hx+Ky=1 ....(ii) Equations (i) and (ii) represent same straight line, then comparing ratio of coefficients we have