MCQ
यदि $\tan ^{-1}\left(\frac{a}{x}\right)+\tan ^{-1}\left(\frac{b}{x}\right)=\frac{\pi}{2}$, तब x =
- ✓$\sqrt{a b}$
- B$\sqrt{2 a b}$
- C$2 a b$
- Dab
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