InterviewSolution
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InterviewSolution
| 1. |
Prove that s ( \frac { \pi } { 4 } - \theta ) \operatorname { cos } ( \frac { \pi } { 4 } - \phi ) - \operatorname { sin } ( \frac { \pi } { 4 } - \theta ) \operatorname { sin } ( \frac { \pi } { 4 } - \phi ) = \operatorname { sin } ( \theta + \phi ) |
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