inv-trig

Question: ${{\tan }^{-1}}\left( \frac{1}{4} \right)+{{\tan }^{-1}}\left( \frac{2}{9} \right)=$

1) $\frac{1}{2}{{\cos }^{-1}}\left( \frac{3}{5} \right)$

2) $\frac{1}{2}{{\sin }^{-1}}\left( \frac{3}{5} \right)$

3) $\frac{1}{2}{{\tan }^{-1}}\left( \frac{3}{5} \right)$

4) ${{\tan }^{-1}}\left( \frac{1}{2} \right)$

Solution:

Explanation: No Explanation

Inverse trigonometric functions

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