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" If "a,b,c" are in A.P the "cot(A)/(2),...

" If "a,b,c" are in A.P the "cot(A)/(2),cot(B)/(2),cot(C)/(2)" are in "

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If a,b,c are in A.P then cot((A)/(2)),cot((B)/(2)),cot((C)/(2)) are in

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In any Delta ABC , cot(A/2),cot(B/2),cot(C/2) are in A.P. , then