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If cos alpha = k cos beta , "show that",...

`If cos alpha = k cos beta , "show that", "tan" ( alpha+beta)/2 = ( 1-k)/(1+k)"cot" (alpha-beta)/2`

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CHHAYA PUBLICATION-TRANSFORMATIONS OF SUMS AND PRODUCTS-Short Answer Type Questions
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  14. If sin A = m sin B, "prove that" "tan" (A-B)/2 = (m-1)/(m+1) "tan" (A+...

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  15. If cos alpha = k cos beta , "show that", "tan" ( alpha+beta)/2 = ( 1-k...

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  16. If "cosec"A + secA = "cosec"B + sec B prove that "tan"(A+B)/2 = cot ...

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  17. If alpha,beta,gamma "are in A.P. show that" cot beta = (sin alpha - si...

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