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| 1. |
\operatorname { tan } 4 \theta = \frac { 4 \operatorname { tan } \theta ( 1 - \operatorname { tan } ^ { 2 } \theta ) } { 1 - 6 \operatorname { tan } ^ { 2 } \theta + \operatorname { tan } ^ { 4 } \theta } |
| Answer» | |