MCQ
${{\tan }^{-1}}\left( \frac{1}{4} \right)+{{\tan }^{-1}}\left( \frac{2}{9} \right)=.........$
- A$\frac{1}{2}{{\cos }^{-1}}\left( \frac{3}{5} \right)$
- B$\frac{1}{2}{{\sin }^{-1}}\left( \frac{3}{5} \right)$
- C$\frac{1}{2}{{\tan }^{-1}}\left( \frac{3}{5} \right)$
- ✓${{\tan }^{-1}}\left( \frac{1}{2} \right)$
