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| 1. |
\left. \begin{array} { l } { \operatorname { tan } ^ { - 1 } ( \frac { 1 } { 1 + 1.2 } ) + \operatorname { tan } ^ { - 1 } ( \frac { 1 } { 1 + 2.3 } ) + } \\ { + \operatorname { tan } ^ { - 1 } ( \frac { 1 } { 1 + n \cdot ( n + 1 ) } ) = \operatorname { tan } ^ { - 1 } \theta } \end{array} \right. |
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