MCQ
$\tan ^{-1}\left(\frac{x}{y}\right)-\tan ^{-1}\left(\frac{x-y}{x+y}\right)=$
- A$\frac{\pi}{2}$
- B$\frac{\pi}{3}$
- ✓$\frac{\pi}{4}$
- D$\frac{\pi}{4}$ या $\frac{3 \pi}{4}$
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