The normal to the rectangular hyperbola xy=c2 at the point t1 meets the curve again at the point...

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The normal to the rectangular hyperbola xy=c2 at the point t1 meets the curve again at the point t2. The value of t13.t2 is
(a) 1
(b) \( \mathrm{c} \)
(c) \( -\mathrm{c} \)
(d) \( -1 \)
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