\operatorname { cos } ( \frac { \pi } { 4 } - A ) \operatorname { cos – InterviewSolution

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1.	\operatorname { cos } ( \frac { \pi } { 4 } - A ) \operatorname { cos } ( \frac { \pi } { 4 } - B ) - \operatorname { sin } ( \frac { \pi } { 4 } - A ) \operatorname { sin } ( \frac { \pi } { 4 } - B ) = \operatorname { sin } ( A + B ) \quad [ N C )
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