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

यदि फलन \(f( x )=\frac{\cos ^{-1} \sqrt{ x ^{2}- x +1}}{\sqrt{\sin ^{-1}\left(\frac{2 x -1}{2}\right)}}\) का प्रान्त, अन्तराल \((\alpha, \beta]\) है, तो \(\alpha+\beta\) बराबर है -

  1. A \(2\)
  2. B \(\frac{3}{2}\)
  3. C \(\frac{1}{2}\)
  4. D \(1\)
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Answer & Solution

Correct Answer

(B) \(\frac{3}{2}\)

Step-by-step Solution

Detailed explanation

\(0 \leq x^{2}-x+1 \leq 1\) \(\Rightarrow x^{2}-x \leq 0\) \(\Rightarrow x \in[0,1]\) \(\text { Also, } 0\,<\,\sin ^{-1}\left(\frac{2 x-1}{2}\right) \leq \frac{\pi}{2}\) \(\Rightarrow 0\,<\,\frac{2 x-1}{2} \leq 1\) \(\Rightarrow 0\,<\,2 x-1 \leq 2\) \(1\,<\,2 x \leq 3\)…
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