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cos(-A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(A+...

`cos(-A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(A+B+C)=4cosAcosBcosC`

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Prove that: cos(A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(-A+B+C)=4cos A cos B cos C

Prove that: a) sin(A+B+C) + sin(A-B-C)+sin(A+B-C) + sin(A-B+C) = 4sinAcosBcosC b) cos(A+B+C)+cos(A+B-C)+cos(B+C-A)+cos(C+A-B)=4cosAcosBcosC

Prove that: cos(A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(-A+B+C)=4cos A\ cos B\ cos C

Prove that: cos(A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(-A+B+C)=4cos A\ cos B\ cos C

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(cos(-A+B+C)+cos(A-B+C)+cos(A+B-C)+cos(A+B+C))/(sin(-A+B+C)-sin(A-B+C)+sin(A+B-C)+sin(A+B+C))=cot B

If A+ B + C = pi, then cos^(2) A + cos ^(2) B + cos ^(2) C is equal to : A) 1 - cos A cos B cos C B) 1 - 2 cos A cos B cos C C) 2 cos A cos B cos C D) 1 + cos A cos B cos C