MCQ
$\int \frac{\sqrt{x^2- a ^2}}{x} dx =?$
- A$\sqrt{x^2- a ^2}+ asec ^{-1}\left(\frac{x}{ a }\right)+ c$
- ✓$\sqrt{x^2- a ^2}- a \cos ^{-1}\left(\frac{ a }{x}\right)+ c$
- C$\sqrt{x^2- a ^2}+\frac{1}{x} \sec ^{-1}(x)+ c$
- D$x \sqrt{x^2- a ^2}-\frac{1}{ a } \tan ^{-1}\left(\frac{x}{ a }\right)+ c$
