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

\(0<\theta<\pi / 2\) के लिए, यदि अतिपरवलय \(\mathrm{x}^2-\mathrm{y}^2 \operatorname{cosec}^2 \theta=5\) की उत्केंद्रता, दीर्घवृत्त \(x^2 \operatorname{cosec}^2 \theta+y^2=5\) की उत्केंद्रता का \(\sqrt{7}\) गुना है, तो \(\theta\) का मान ........... है।

  1. A \(\frac{\pi}{6}\)
  2. B \(\frac{5 \pi}{12}\)
  3. C \(\frac{\pi}{3}\)
  4. D \(\frac{\pi}{4}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{\pi}{3}\)

Step-by-step Solution

Detailed explanation

\(e_h=\sqrt{1+\sin ^2 \theta}\) \(e_c=\sqrt{1-\sin ^2 \theta}\) \(e_h=\sqrt{7} e_c\) \(1+\sin ^2 \theta=7\left(1-\sin ^2 \theta\right)\) \(1+\sin ^2 \theta=7\left(1-\sin ^2 \theta\right)\) \(\sin ^2 \theta=\frac{6}{8}=\frac{3}{4}\) \(\sin \theta=\frac{\sqrt{3}}{2}\)…
Same subject
Explore more questions on app
From JEE Mains
Explore more questions on app