The tangent to the hyperbola, xy=c2 at a point P intersects the x-axis at T and the y-axis at T′. The normal to the hyperbola at P intersects x-axis at N and y-axis at N′. The areas of the triangles PNT and PN′T′ are Δ and Δ′ respectively, then 1Δ+1Δ′ is

The tangent to the hyperbola, xy=c2 at a point P intersects the x-axis

1.	The tangent to the hyperbola, xy=c2 at a point P intersects the x-axis at T and the y-axis at T′. The normal to the hyperbola at P intersects x-axis at N and y-axis at N′. The areas of the triangles PNT and PN′T′ are Δ and Δ′ respectively, then 1Δ+1Δ′ is
Answer» The tangent to the hyperbola, $x y = c^{2}$ at a point $P$ intersects the x-axis at $T$ and the y-axis at $T^{'} .$ The normal to the hyperbola at $P$ intersects x-axis at $N$ and y-axis at $N^{'} .$ The areas of the triangles $P N T$ and $P N^{'} T^{'}$ are $Δ$ and $Δ^{'}$ respectively, then $\frac{1}{Δ} + \frac{1}{Δ^{'}}$ is