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AP EAMCET · Maths · Indefinite Integration

If \(f(x)\) is anti-derivative of \(g(x)\) and \(\int f(x) g(x)\left(1+f^2(x)\right) d x=F(x)\), then \(F(x)=\)

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

Answer & Solution

Correct Answer

(A) \(\frac{\left.\left(1+f^2 x\right)\right)^2}{4}+C\)

Step-by-step Solution

Detailed explanation

Given, \(f(x)=\int g(x) d x\) \(\Rightarrow f^{\prime}(x)=g(x)\) \(F(x)=\int f(x) g(x)\left(1+f^2(x)\right) d x\) On putting \(1+f^2(x)=t\) \(\Rightarrow \quad 2 f(x): f^{\prime}(x) d x=d t\)…