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यदि a,b,c समान्तर श्रेणी (A.P.) में हो, ...

यदि a,b,c समान्तर श्रेणी (A.P.) में हो, तो सिध्द कीजिए कि -
`cot""(A)/(2),cot""(B)/(2),cot""(C)/(2)` भी समान्तर श्रेणी में होंगे ।

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