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यदि tan (A+B) = n tan (A-B) , तो सिद्ध ...

यदि `tan (A+B) = n tan (A-B)` , तो सिद्ध कीजिए कि
` (n+1)/(n-1)= (sin 2A)/(sin2B).`
(ii) ` tan alpha = x+1 ` और ` tan beta = x -1 ,` तो सिद्ध कीजिए कि
` 2 cot (alpha - beta)= x^(2)`

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