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If cos A=mcosB ,\ t h e ncot(A+B)/2cot(B...

If `cos A=mcosB ,\ t h e ncot(A+B)/2cot(B-A)/2` `adot\ (m-1)/(m+1)` b. `(m+2)/(m-2)` c. `(m+1)/(m-1)` d. none of these

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Given,

`cos A = m cos B`

`cos A/cos B = m/1`

Using componendo and dividendo rule,

...
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