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JEE Mains · Maths · STD 11- 2. Relation and Function

माना फलन
\(f(x)=\cos ^{-1}\left(\frac{4 x+5}{3 x-7}\right)\) का प्रांत \([\alpha, \beta]\) है तथा फलन \(\mathrm{g}(\mathrm{x})=\log _2\left(2-6 \log _{27}(2 \mathrm{x}+5)\right)\) का प्रांत \((\gamma, \delta)\) है।
तब \(|7(\alpha+\beta)+4(\gamma+\delta)|\) = __________

  1. A 92
  2. B 94
  3. C 96
  4. D 98
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Answer & Solution

Correct Answer

(C) 96

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Detailed explanation

\(\begin{aligned} & f(x)=\cos ^{-1}\left(\frac{4 x+5}{3 x-7}\right) \\ & \Rightarrow-1 \leq\left(\frac{4 x+5}{3 x-7}\right) \leq 1 \\ & \left(\frac{4 x+5}{3 x-7}\right) \geq-1 \\ & \frac{4 x+5+3 x-7}{3 x-7} \geq 0 \\ & \Rightarrow \frac{7 x-2}{3 x-7} \geq 0\end{aligned}\)…
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