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The tangent to the hyperbola xy=c^2 at t...

The tangent to the hyperbola `xy=c^2` at the point P intersects the x-axis at T and y- axis at T'.The normal to the hyperbola at P intersects the x-axis at N and the y-axis at N' . The areas of the triangles PNT and PN'T' are `Delta` and `Delta'` respectively, then `1/Delta+1/(Delta)'` is (A) equal to 1 (B) depends on t (C) depends on c D) equal to 2

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