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| 1. |
\frac { \operatorname { sin } ( A + B ) } { \operatorname { sin } ( A - B ) } = \frac { \alpha + \beta } { \alpha - \beta } , \text { show that } \frac { \operatorname { tan } A } { \operatorname { tan } B } = \frac { \alpha } { \beta } |
| Answer» | |