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JEE Mains · Maths · STD 12 - 5. continuity and differentiation

माना \(f ( x )=\log _{ e }(\sin x ),(0< x <\pi)\) तथा \(g ( x )=\sin ^{-1}\left( e ^{- x }\right),( x \geq 0)\) हैं। यदि एक धनात्मक वास्तविक संख्या \(\alpha\) के लिए \(a =(\operatorname{fog})^{\prime}(\alpha)\) तथा \(b =( fog )(\alpha)\) है, तो

  1. A \(a{x^2}\, + \,b\alpha \, - a\, = 2{\alpha ^2}\)
  2. B \(a{x^2}\, - \,b\alpha \, - a\, = 0\)
  3. C \(a{x^2}\, - \,b\alpha \, - a\, = 1\)
  4. D \(a{x^2}\, + \,b\alpha \, + a\, = 0\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(a{x^2}\, - \,b\alpha \, - a\, = 1\)

Step-by-step Solution

Detailed explanation

\(fog\,(x)\, = \,( - x)\, \Rightarrow \,\left( {fog\left( \alpha \right)} \right)\, = \, - \,\alpha \, = \,b\) \((fog\,(x))'\, = \, - 1\, \Rightarrow \,\left( {fog\left( \alpha \right)} \right)'\, = \, - \,1\, = \,a\)
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