prove that the following is true- cos 2 A+cos 2 B+cos 2 C=1-2cosAcosBcosC

Question

Vikas TU · Answer

Take R.H.S, 1-2cosAcosBcosC, apply 2cosAcosB formulae and split into a+b form . Then write 1 as (sinA)^2 + (cosA)^2 and the sort out u would get L.H.S

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prove that the following is true- cos 2 A+cos 2 B+cos 2 C=1-2cosAcosBcosC

prove that the following is true-
cos²A+cos²B+cos²C=1-2cosAcosBcosC

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prove that the following is true- cos 2 A+cos 2 B+cos 2 C=1-2cosAcosBcosC

prove that the following is true-cos2A+cos2B+cos2C=1-2cosAcosBcosC

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prove that the following is true-
cos²A+cos²B+cos²C=1-2cosAcosBcosC