\operatorname { tan } ^ { - 1 } \frac { 1 } { 2 } + \operatorname { ta – InterviewSolution

1.	\operatorname { tan } ^ { - 1 } \frac { 1 } { 2 } + \operatorname { tan } ^ { - 1 } \frac { 1 } { 5 } + \operatorname { tan } ^ { - 1 } \frac { 1 } { 8 } = \frac { \pi } { 4 }
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