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AP EAMCET · Maths · Indefinite Integration

If \(\int \frac{5 \tan \mathrm{x}}{\tan \mathrm{x}-2} \mathrm{dx}=\mathrm{ax}+\mathrm{b} \log |\sin \mathrm{x}-2 \cos \mathrm{x}|+\mathrm{c}\), then \(\mathrm{a}+\mathrm{b}=\)

  1. A \(2\)
  2. B \(3\)
  3. C \(4\)
  4. D \(-1\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(3\)

Step-by-step Solution

Detailed explanation

\( \int \frac{5 \tan x}{\tan x - 2} dx = \int \frac{5 \sin x}{\sin x - 2 \cos x} dx \) Let \( 5 \sin x = A(\sin x - 2 \cos x) + B(\cos x + 2 \sin x) \) \( A+2B=5 \) \( -2A+B=0 \Rightarrow B=2A \) \( A+2(2A)=5 \Rightarrow 5A=5 \Rightarrow A=1 \) \( B=2(1)=2 \)…