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if cosA = K cos(A - 2B) then prove tan(A -B) = 1 - K/1 + K × cotB
Dear student cos (A – 2B) / cos A = 1/k cos (A – 2B) – cos A / cos (A – 2B) + cos A = 1 – k / 1+ k tan (A – B) * cot B = 1 – k / 1 + k Hence proved
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