Establish the identity.sin ?[sin ? + sin(5?)] = cos(2?)[cos(2?) - cos(4?)]
What will be an ideal response?
sin ?[sin ? + sin(5?)] = sin ?[2 sin(3?) cos(2?)] = 2 cos(2?)[sin ? sin(3?)] 
= cos(2?)[cos(2?) - cos(4?)]
Mathematics
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