Mathematics, 01.04.2020 20:47 Dweath50

If A+B+C=180 then prove that
Cos3Acos3B+cos3Bcos3C+cos3Ccos3A=1

Answers: 2

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If A+B+C=180 then prove that
Cos3Acos3B+cos3Bcos3C+cos3Ccos3A=1...