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| 1. |
( \text { iil } ) \frac { \operatorname { tan } \theta } { 1 - \operatorname { cot } \theta } + \frac { \operatorname { cot } \theta } { 1 - \operatorname { tan } \theta } = 1 + \operatorname { sec } \theta \operatorname { cosec } \theta = 1 + \operatorname { tan } \theta + \operatorname { cot } \theta |
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