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| 1. |
\left. \begin{array} { l } { 1 - 2 \operatorname { sin } ^ { 2 } ( \frac { \pi } { 4 } + \theta ) = } \\ { ( 1 ) \operatorname { cos } 2 \theta ^ { \prime } ( 2 ) - \operatorname { cos } 2 \theta ( 3 ) \operatorname { sin } 2 \theta ( 4 ) - \operatorname { sin } 2 \theta } \end{array} \right. |
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