Easy MCQ +4 / -1 PYQ · JEE Mains 2021

The line $12x\cos \theta + 5y\sin \theta = 60$ is tangent to which of the following curves?

  1. A x<sup>2</sup> + y<sup>2</sup> = 169
  2. B 144x<sup>2</sup> + 25y<sup>2</sup> = 3600 Correct answer
  3. C 25x<sup>2</sup> + 12y<sup>2</sup> = 3600
  4. D x<sup>2</sup> + y<sup>2</sup> = 60

Solution

$12x\cos \theta + 5y\sin \theta = 60$<br><br>${{x\cos \theta } \over 5} + {{y\sin \theta } \over {12}} = 1$<br><br>is tangent to ${{{x^2}} \over {25}} + {{{y^2}} \over {144}} = 1$<br><br>$144{x^2} + 25{y^2} = 3600$

About this question

Subject: Mathematics · Chapter: Conic Sections · Topic: Parabola

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