If A+B+C=π, prove that cos 4  A+cos 4  B+cos 4 C =-1+4 cos 2  Acos 2  Bcos 2 C

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If A+B+C=π, prove that

cos 4  A+cos 4  B+cos 4 C
=-1+4 cos 2  Acos 2  Bcos 2 C

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