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AP EAMCET · Maths · Indefinite Integration

\(\int e^{3 \log x}\left(x^4+1\right)^{-1} d x=\)

  1. A \(e^{3 \log x}+c\)
  2. B \(\frac{1}{4} \log \left(x^4+1\right)+c\)
  3. C \(\frac{1}{3} \log \left(x^4+1\right)+c\)
  4. D \(\frac{x^4}{x^4+1}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{1}{4} \log \left(x^4+1\right)+c\)

Step-by-step Solution

Detailed explanation

\(I=\int e^{3 \log x}\left(x^4+1\right)^{-1} d x=\int x^3\left(x^4+1\right)^{-1} d x\) Let \(x^4+1=t \Rightarrow 4 x^3 d x=d t\) \[ \therefore \quad I=\frac{1}{4} \int \frac{d t}{t}=\frac{1}{4} \log _e(t)+C=\frac{1}{4} \log _e\left(x^4+1\right)+C \]