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JEE Main 20231 FebruaryEvening Shift
Exam
JEE Main
Year
2023
Date
1 February
Shift
Evening Shift
Subject
Mathematics
Chapter
Hyperbola

JEE Main 2023 · 1 February · Evening Shift · Mathematics · Hyperbola

Let P( x _ 0 , y _ 0 ) be the point on the hyperbola 3 x ^ 2 - 4 y...

Let P(x0,y0)P\left({x}_{0}, {y}_{0}\right) be the point on the hyperbola 3x2−4y2=363{x}^{2} - 4{y}^{2} = 36, which is nearest to the line 3x+2y=13x + 2y = 1. Then 2(y0−x0)\sqrt{2}\left({y}_{0} - {x}_{0}\right) is equal to :

Options

  1. A−3- 3
  2. B99
  3. C−9- 9
  4. D33

Correct answer

C. −9- 9

Step-by-step solution

Given,

Equation of hyperbola, 3x2−4y2=363{x}^{2} - 4{y}^{2} = 36

And nearest line 3x+2y=13x + 2y = 1

Now slope of the given line will be, m=−32m = - \dfrac{3}{2}

Now slope of tangent which will be parallel to given line of hyperbola 3x2−4y2=363{x}^{2} - 4{y}^{2} = 36 is given by,

m=3secθ12⋅tanθm = \dfrac{3sec\theta}{\sqrt{12} \cdot tan\theta}

Now putting the value of m=−32m = \dfrac{- 3}{2} we get,

⇒312×1sinθ=−32⇒ \dfrac{3}{\sqrt{12}} \times \dfrac{1}{sin\theta} = \dfrac{- 3}{2}

⇒sinθ=−13⇒ sin\theta = - \dfrac{1}{\sqrt{3}}

So, point will be \left(\sqrt{12}sec\theta, 3tan\theta\right)</p><p></p><p>= \left(\sqrt{12} \cdot \dfrac{\sqrt{3}}{\sqrt{2}}, - 3 \times \dfrac{1}{\sqrt{2}}\right)

=(62,−32)= \left(\dfrac{6}{\sqrt{2}}, \dfrac{- 3}{\sqrt{2}}\right),

Hence, 2(y0−x0)=2(−32−62)=−9\sqrt{2}\left({y}_{0} - {x}_{0}\right) = \sqrt{2}\left(\dfrac{- 3}{\sqrt{2}} - \dfrac{6}{\sqrt{2}}\right) = - 9

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