MCQ
$\tan ^{-1} \frac{4}{3}+\tan ^{-1} \frac{1}{7}=$
- ✓$\tan ^{-1} \frac{31}{17}$
- B$\tan ^{-1} \frac{31}{21}$
- C$\tan ^{-1} \frac{12}{19}$
- D$\tan ^{-1} \frac{3}{4}$
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