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JEE Mains · Maths · STD 11 - 10.2 parabola,ellipse,hyperbola

माना दीर्घवृत्त \(9 x^2+4 y^2=36\) पर चार बिंदु \(\mathrm{P}\left(\frac{2 \sqrt{3}}{\sqrt{7}}, \frac{6}{\sqrt{7}}\right), \mathrm{Q}, \mathrm{R}\) तथा \(\mathrm{S}\) हैं। माना रेखाखंड \(\mathrm{PQ}\) तथा \(\mathrm{RS}\) परस्पर लंबवत है तथा मूलबिंदु से होकर जाते हैं। यदि \(\frac{1}{(\mathrm{PQ})^2}+\frac{1}{(\mathrm{RS})^2}=\frac{\mathrm{p}}{\mathrm{q}}\), जहाँ \(\mathrm{p}\) तथा \(q\) असहभाज्य है, तो \(\mathrm{p}+\mathrm{q}\) बराबर है :

  1. A \(143\)
  2. B \(137\)
  3. C \(157\)
  4. D \(147\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(157\)

Step-by-step Solution

Detailed explanation

Let \(R (2 \cos \theta, 3 \sin \theta)\) as \(OP \perp OR\) \(\text { so } \frac{3 \sin \theta}{2 \cos \theta} \times \frac{\frac{6}{\sqrt{7}}}{\frac{2 \sqrt{3}}{\sqrt{7}}}=-1\) \(\Rightarrow \tan \theta=\frac{-2}{3 \sqrt{3}}\)…
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