InterviewSolution
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InterviewSolution
| 1. |
\begin{array} { l } { \text { Prove that } } \\ { \tan ^ { - 1 } \left( \frac { 1 } { 3 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 5 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 7 } \right) + \tan ^ { - 1 } \left( \frac { 1 } { 8 } \right) } \end{array} |
| Answer» | |