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| 1. |
\left. \begin{array} { l } { \operatorname { tan } 3 A \operatorname { tan } 2 A \operatorname { tan } A = \operatorname { tan } 3 A - \operatorname { tan } 2 A - \operatorname { tan } A } \\ { E N / A S / B N ) } \end{array} \right. |
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