[" 357.If "sin((x+y)/(2))=sin x+sin y" a...

[" 357.If "sin((x+y)/(2))=sin x+sin y" and "sin((x-y)/(2))!=0" ,"],[" then "(dy)/(dx)=],[" A) "1," B) "-1],[" C) "2," D) "-2]

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