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| 1. |
\operatorname { cos } ( \frac { 3 \pi } { 2 } + x ) \operatorname { cos } ( 2 \pi + x ) [ \operatorname { cot } ( \frac { 3 \pi } { 2 } - x ) + \operatorname { cot } ( 2 \pi + x ) ] = 1 |
| Answer» | |