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Thank you so much

Can you give me some clues about how to work with this kind of problems. I get really confused

Not about the problem you just solved. But in general

Can you help me with this one?
(cosA+cosB)/(cosA-cosB)=cot((1/2)(A-B))cot((1/2)(A+B))

Ok thank you very much

In the third line, how do you get "cos(3A)sin(4A)"

I got it now. Clear