question_answer

If \[{{\tan }^{-1}}\frac{1}{2}+{{\tan }^{-1}}\frac{1}{3}=\]

A)  \[0\]                            

B)  \[\frac{\pi }{4}\]

C)  \[\frac{\pi }{2}\]                                   

D)  \[\pi \]

E)  None of these