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

माना त्रिज्या \(4\) का एक वृत्त तथा दीर्घवृत्त \(15 \mathrm{x}^2+19 \mathrm{y}^2=285\) संकेन्द्री है, तो उभयनिष्ठ स्पर्श रेखाएँ दीर्घवृत्त के लघु अक्ष से कौन सा कोण बनाती है?ined to the minor axis of the ellipse at the angle.

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

Answer & Solution

Correct Answer

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

Step-by-step Solution

Detailed explanation

\(\frac{x^2}{19}+\frac{y^2}{15}=1\) Let tang be \(y = mx \pm \sqrt{19 m^2+15}\) \(mx - y \pm \sqrt{19 m^2+15}=0\) Parallel from \((0,0)=4\) \(\left|\frac{ \pm \sqrt{19 m ^2+15}}{\sqrt{ m ^2+1}}\right|=4\) \(19 m ^2+15=16 m ^2+16\) \(3 m ^2=1\) \(m = \pm \frac{1}{\sqrt{3}}\)…
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