3 years ago

Cos (B+C - A) + cos (C+ A-B) + cos( A+B+C)= 1 + 4 cos A.cos B.cos C.

Mathematics

2 answers:

Stels [109]3 years ago

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Can you explain more

Shtirlitz [24]3 years ago

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Cos (B+C - A) + cos (C+ A-B) + cos( A+B+C)= 1 + 4 cos A.cos B.cos C.​

Cos (B+C - A) + cos (C+ A-B) + cos( A+B+C)= 1 + 4 cos A.cos B.cos C.