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साबित करें कि ((cosA+cosB)/(sinA-sinB)...

साबित करें कि
`((cosA+cosB)/(sinA-sinB))^(n)+((sinA+sinB)/(cosA-cosB))^(n)=0` या (or) `2 cot^(n). (A-B)/(2)` जबकि n क्रमशः सम तथा विषम संख्या हो ।

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