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| 1. |
\frac { \operatorname { tan } A } { ( 1 - \operatorname { cot } A ) } + \frac { \operatorname { cot } A } { ( 1 - \operatorname { tan } A ) } = ( 1 + \operatorname { tan } A + \operatorname { cot } A ) |
| Answer» | |