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[" 25.If "sin A sin(60^(@)-A)sin(60^(@)+...

[" 25.If "sin A sin(60^(@)-A)sin(60^(@)+A)=k sin3A,],[" then what is "k" equal to? "]

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If sin A sin (60^(@)-A)sin(60^(@)+A)=ksin3A , then what is k equal to ?

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