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

वत्त \((x-3)^{2}+y^{2}=9\) तथा परवलय \(y^{2}=4 x\) की एक उभयनिष्ठ स्पर्श रेखा है। यदि दो संपर्क बिन्दु \(( a , b )\) तथा \(( c , d )\) भिन्न हैं तथा प्रथम चतुर्थाश में है, तो \(2( a + c )\) बराबर है .............

  1. A \(9\)
  2. B \(3\)
  3. C \(4\)
  4. D \(6\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(9\)

Step-by-step Solution

Detailed explanation

Let coordinate of point \(A \left( t ^{2}, 2 t \right) \quad(\because a =1)\) equation of tangent at point \(A\) \(y t=x+t^{2}\) centre of circle \((3,0)\) Now \(PD =\) radius \(\left|\frac{3-0+t^{2}}{\sqrt{1+t^{2}}}\right|=3\) \(\left(3+t^{2}\right)^{2}=9\left(1+t^{2}\right)\)…
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