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JEE Mains · Maths · STD 12 - 2. inverse trigonometric function

જો વિધેય \(f(x)=\sin ^{-1}\left(\frac{1}{x^2-2 x-2}\right)\) નો પ્રદેશ \((-\infty, \alpha] \cup[\beta, \gamma] \cup[\delta, \infty)\) હોય, તો \(\alpha+\beta+\gamma+\delta=\) ___ .

  1. A 2
  2. B 4
  3. C 3
  4. D 5
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Answer & Solution

Correct Answer

(B) 4

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Detailed explanation

\( -1 \le \frac{2}{x^2-2x-2} \le 1 \) \(\frac{1+x^2-2 x-2}{x^2-2 x-2} \geq 0 \Rightarrow \frac{(x-1)^2-2}{(x-1)^2-3} \geq 0\) \(\Rightarrow \frac{(x-1-\sqrt{2})(x-1+\sqrt{2})}{(x-1-\sqrt{3})(x-1+\sqrt{3})} \geq 0\)…
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