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Question

Which of the following are correct for properties of rectangular hyperbola
xy=c2

A
Area of triangle formed by tangent to xy=c2 and its intercept is constant and equal to c2.
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B
The slope of the tangent for xy=c2 is always negative.
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C
If the normal to the rectangular hyperbola xy=c2 at the point (t1) meets the curve again at the point (t2), then t31t2=1.
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D
If a triangle has its vertices on a rectangular hyperbola, then its orthocenter is H(c2t1t2t3,ct1t2t3).
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Solution

The correct option is C If the normal to the rectangular hyperbola xy=c2 at the point (t1) meets the curve again at the point (t2), then t31t2=1.
Option A) The slope of the tangent and slope of the normal for a rectangular hyperbola xy=c2 are always negative and positive respectively.
Correct

Option B) Area of triangle formed by tangent to hyperbola xy=c2 and its intercept is constant and equal to 2c2.
Incorrect

Option C) If the normal to the rectangular hyperbola xy=c2 at the point (t1) meets the curve again at the point (t2), then t31t2=1.
Correct

Option D) If a triangle has its vertices on a rectangular hyperbola, then its orthocenter is H(ct1t2t3,ct1t2t3).
Incorrect

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