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If none of A,B, A+B is an integral multi...

If none of A,B, A+B is an integral multiple of `pi`, then prove that `(1- cos A+ cos B- cos (A+B))/(1+ cos A- cos B - cos (A+B))=tan.(A)/(2) cot. (B)/(2)`

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The correct Answer is:
`tan .(A)/(2) cot. (B)/(2).`
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