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                Prove that:
2sinxsiny = cos(x-y) - cos(x+y)
            
        2sinxsiny = cos(x-y) - cos(x+y)
Answers
                    Answered by
            drwls
            
    Rewrite the right side, using 
cos (x + y) = cos x cos y - sin x sin y
cos (x - y) = cos x cos y + sin x sin y
You should be familiar with those two identities.
    
cos (x + y) = cos x cos y - sin x sin y
cos (x - y) = cos x cos y + sin x sin y
You should be familiar with those two identities.
                    Answered by
            nando
            
    kagr
    
                    Answered by
            Simone 
            
    To price this equation first subtract cos(x-y) and cos(x+y) 
=cosXcosY + sinXsinY
-(cosXcosY-sinXsinY)
= 2sinXsinY
Hence , proved!
    
=cosXcosY + sinXsinY
-(cosXcosY-sinXsinY)
= 2sinXsinY
Hence , proved!
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