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

यादि कोई फलन \(f(x)\) इस प्रकार परिभाषित है कि \(f(x)=\left\{\begin{array}{ll}a e^{x}+b e^{-x}, & -1 \leq x<1 \\ c x^{2}, & 1 \leq x \leq 3 \\ a x^{2}+2 c x, & 3 < x \leq 4\end{array}\right.\) कुछ \(a, b, c \in R\) के लिए सतत् है और \(f^{\prime}(0)+f^{\prime}(2)=e\), तो \(a\) का मान है

  1. A \(\frac{e}{e^{2}-3 e-13}\)
  2. B \(\frac{e}{e^{2}+3 e+13}\)
  3. C \(\frac{1}{e^{2}-3 e+13}\)
  4. D \(\frac{\mathrm{e}}{\mathrm{e}^{2}-3 \mathrm{e}+13}\)
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Answer & Solution

Correct Answer

(D) \(\frac{\mathrm{e}}{\mathrm{e}^{2}-3 \mathrm{e}+13}\)

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Detailed explanation

\(f(x)=\left\{\begin{array}{ll}a e^{x}+b e^{-x}, & -1 \leq x<1 \\ c x^{2}, & 1 \leq x \leq 3 \\ a x^{2}+2 c x, & 3 < x \leq 4\end{array}\right.\) For continuity at \(\mathrm{x}=1\) \(\lim _{x \rightarrow 1^{-}} f(x)=\lim _{x \rightarrow 1^{+}} f(x)\)…
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