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TS EAMCET · Maths · Indefinite Integration

\(\int\left(\sqrt{\frac{a+x}{a-x}}+\sqrt{\frac{a-x}{a+x}}\right) d x\) is equal to

  1. A \(2 \sin ^{-1}\left(\frac{x}{a}\right)+C\)
  2. B \(2 a \sin ^{-1}\left(\frac{x}{a}\right)+C\)
  3. C \(2 \cos ^{-1}\left(\frac{x}{a}\right)+C\)
  4. D \(2 a \cos ^{-1}\left(\frac{x}{a}\right)+C\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(2 a \sin ^{-1}\left(\frac{x}{a}\right)+C\)

Step-by-step Solution

Detailed explanation

\begin{aligned} & \text { Let } I=\int\left(\sqrt{\frac{a+x}{a-x}}+\sqrt{\frac{a-x}{a+x}}\right) d x \\ & \text { Put } x=a \cos 2 \theta \Rightarrow d x=-2 a \sin 2 \theta d \theta \\ & \therefore I=-\int\left(\sqrt{\frac{a+a \cos 2 \theta}{a-a \cos 2 \theta}}+\sqrt{\frac{a-a…