( i ) \quad \operatorname { sin } ( 45 ^ { \circ } + A ) \operatorname – InterviewSolution

1.	( i ) \quad \operatorname { sin } ( 45 ^ { \circ } + A ) \operatorname { sin } ( 45 ^ { \circ } - A ) = \frac { 1 } { 2 } \operatorname { cos } 2 A
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