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

Let \(0 < \theta  < \frac{\pi }{2}\). If the eccentricity of the hyperbola \(\frac{{{x^2}}}{{{{\cos }^2}\,\theta }} - \frac{{{y^2}}}{{{{\sin }^2}\,\theta }} = 1\) is greater than \(2\), then the length of its latus rectum lies in the interval

  1. A \(\left( {3,\infty } \right)\)
  2. B \(\left( {\frac{3}{2},2} \right]\)
  3. C \(\left( {2,3} \right]\)
  4. D \(\left( {1,\frac{3}{2}} \right]\)
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Answer & Solution

Correct Answer

(A) \(\left( {3,\infty } \right)\)

Step-by-step Solution

Detailed explanation

\(\frac{{{x^2}}}{{{{\cos }^2}\theta }} - \frac{{{y^2}}}{{{{\sin }^2}\theta }} = 1\) \(\because \) \(e > 2\) (given) \({e^2} > 4 \Rightarrow 1 + \frac{{{{\sin }^2}\theta }}{{{{\cos }^2}\theta }} > 4\) \( \Rightarrow 1 + {\tan ^2}\theta > 4\) \( \Rightarrow {\tan ^2}\theta > 3\)…
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