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TS EAMCET · Maths · Indefinite Integration

If \(\int x^3 \sin 3 x d x=f(x) \cos 3 x+g(x) \sin 3 x+c\) then, \(27(f(x)+x g(x))=\)

  1. A \(18 x^3+4 x\)
  2. B \(8 x\)
  3. C \(4 x\)
  4. D \(18 x^3+8 x\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(4 x\)

Step-by-step Solution

Detailed explanation

\(\int x^3 \sin 3 x d x=x^3\left(\frac{-\cos 3 x}{3}\right)+\int x^2 \cos 3 x d x\)…