Prove that cos2𝐴+cos2𝐵+2cos𝐴.cos𝐵.cos𝐶=sin2𝐶 .
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Prove that cos2𝐴+cos2𝐵+2cos𝐴.cos𝐵.cos𝐶=sin2𝐶 .
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.