[" (a) GP "quad " (b) HP "quad " (c) AP ...

[" (a) GP "quad " (b) HP "quad " (c) AP "],[" 13.If "sin x+sin y=sqrt(3)(cos y-cos x)," then "sin3x+sin3y=],[" (a) "2sin3xquad " (b) "0quad " (c) "1]quad " (d) none of these "

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