Can someone help me to prove this?
(cosA+cosB)/(cosA-cosB)=cot((1/2)(A-B))cot((1/2)(A+B))

Can someone help me to prove this?
(cosA+cosB)/(cosA-cosB)=cot((1/2)(A-B))cot((1/2)(A+B))

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yeah I need help. Im really confused with this

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