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

यदि \(2 \mathrm{x}^{\mathrm{y}}+3 \mathrm{y}^{\mathrm{x}}=20\) है, तब \((2,2)\) पर \(\frac{\mathrm{dy}}{\mathrm{dx}}\) का मान है

  1. A \(-\left(\frac{3+\log _e 8}{2+\log _e 4}\right)\)
  2. B \(-\left(\frac{2+\log _e 8}{3+\log _e 4}\right)\)
  3. C \(-\left(\frac{3+\log _e 16}{4+\log _e 8}\right)\)
  4. D \(-\left(\frac{3+\log _e 4}{2+\log _e 8}\right)\)
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Answer & Solution

Correct Answer

(B) \(-\left(\frac{2+\log _e 8}{3+\log _e 4}\right)\)

Step-by-step Solution

Detailed explanation

\(2 x^y+3 y^x=20\) \(2 x^y\left[\frac{y}{x}+(\ln x) y^{\prime}\right]+3 y^x\left[\frac{x y^{\prime}}{y}+\ln y\right]=0\) \(y^{\prime}=\frac{-(12 \ln 2+8)}{12+8 \ln 2}=-\left(\frac{2+\log _e 8}{3+\log _e 4}\right)\)
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