1.

\frac { \operatorname { cos } \theta } { 1 - \operatorname { sin } \theta } + \frac { \operatorname { sin } \theta } { 1 - \operatorname { cos } \theta } + 1 = \frac { \operatorname { sin } \theta \cdot \operatorname { cos } \theta } { ( 1 - \operatorname { sin } \theta ) ( 1 - \operatorname { cos } \theta ) }

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