The value of \({\tan ^{ - 1}}\left( {\frac{1}{2}} \right) + {\tan ^{ - 1}}\left( {\frac{1}{3}} \right)\) is

1
π
2
\(\frac{\pi }{2}\)
3
\(\frac{\pi }{3}\)
4
\(\frac{\pi }{4}\)

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