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JEE Mains · Maths · STD 12 - 1. relation and function

माना \(R =\{( P , Q ) \mid P\) तथा \(Q\), मूलबिंदु से समान दूरी पर हैं \(\}\) एक संबंध है। तो \((1,-1)\) का तुल्यता-वर्ग निम्न में से कौन सा समच्चय है ?

  1. A \(S =\left\{( x , y ) \mid x ^{2}+ y ^{2}=4\right\}\)
  2. B \(S =\left\{( x , y ) \mid x ^{2}+ y ^{2}=1\right\}\)
  3. C \(S =\left\{( x , y ) \mid x ^{2}+ y ^{2}=\sqrt{2}\right\}\)
  4. D \(S=\left\{(x, y) \mid x^{2}+y^{2}=2\right\}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(S=\left\{(x, y) \mid x^{2}+y^{2}=2\right\}\)

Step-by-step Solution

Detailed explanation

Equivalence class of \((1,-1)\) is a circle with centre at \((0,0)\) and radius \(=\sqrt{2}\) \(\Rightarrow x^{2}+y^{2}=2\) \(S=\left\{(x, y) \mid x^{2}+y^{2}=2\right\}\)
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