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Prove that cosα+cosα+β+cosα+2β+...+cosα+n-1β=cosα+n-12βsinnβ2sinβ2 for all n∈N. [NCERT EXEMPLAR]

Answer» Prove that cosα+cosα+β+cosα+2β+...+cosα+n-1β=cosα+n-12βsinnβ2sinβ2 for all nN. [NCERT EXEMPLAR]


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