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the sum to n terms of the series (cos3x)/(sin2x)(sin4x) + (cos5x)/(sin4x)(sin6x) + (cos7x)/(sin6x)(sin8x)....is Pls answer step by step...urgemtly needed

the sum to n terms of the series
 
 
(cos3x)/(sin2x)(sin4x) + (cos5x)/(sin4x)(sin6x) + (cos7x)/(sin6x)(sin8x)....is
Pls answer step by step...urgemtly needed
 

Grade:9

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