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

ધારોકે \(f: R \rightarrow R\) એ \(f(x+y)=2^{x} f(y)+4^{y} f(x), \forall x, y \in R\). નું સમાધાન કરે છે. \(f(2)=3\), હોય., તો \(14 \cdot \frac{f^{\prime}(4)}{f^{\prime}(2)}=\dots\dots\)

  1. A \(246\)
  2. B \(250\)
  3. C \(248\)
  4. D \(251\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(248\)

Step-by-step Solution

Detailed explanation

Put \(y=2\) \(f(x+y)=2^{x} \cdot f(y)+4^{y} \cdot f(x)\) \(f(x+2)=2^{x} \cdot 3+16 f(x)\) \(f^{\prime}(x+2)=16 f^{\prime}(x)+3 \cdot 2^{x} \ln 2\) \(f^{\prime}(4)=16 f^{\prime}(2)+12 \ln 2\) ...\((i)\) \(f(y+2)=4 f(y)+3 \cdot 4^{y}\)…
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