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| 1. |
\frac { ( 1 + \operatorname { cot } A + \operatorname { tan } A ) ( \operatorname { sin } A - \operatorname { cos } A ) } { \operatorname { sec } ^ { 3 } A - \operatorname { cos } e c ^ { 3 } A } = \operatorname { sin } ^ { 2 } A \operatorname { cos } ^ { 2 } A |
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