prove that

2tan^{-1} [ { (a-b) / (a+b) }^{1/2 }tan x/2 ] = cos^{-1}{ (b +acos x ) / (a+bcos x) }

let ..............(1)

let ..............(2)

from (1) and (3)

therefore

using equation (2)

thus

hope this helps you.

cheers!!

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prove that

2tan^{-1} [ { (a-b) / (a+b) }^{1/2 }tan x/2 ] = cos^{-1}{ (b +acos x ) / (a+bcos x) }

let ..............(1)

let ..............(2)

from (1) and (3)

therefore

using equation (2)

thus

hope this helps you.

cheers!!

**
**

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