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[" 1) The value of "sin(n+1)A sin(n+2)A+...

[" 1) The value of "sin(n+1)A sin(n+2)A+cos],[(n+a)A cos(n+2)A" is equal to "],[[" A) "sin A," B ")cos A," C) "-cos A," D) "sin2A]]

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