p { margin-bottom: 0.25cm; line-height: 120%; }
If A+B+C+D=2S,prove that
cos²S+cos²(S-A)+cos²(S-B)+cos²(S-C)=2+2cosAcosBcosC

Question

p { margin-bottom: 0.25cm; line-height: 120%; } If A+B+C+D=2S,prove that cos 2 S+cos 2 (S-A)+cos 2 (S-B)+cos 2 (S-C)=2+2cosAcosBcosC

Saurabh Koranglekar · Answer

Dear student Please check the question If you check values at s= 90, A = 45 Lhs=! Rhs Regards

Vikas TU · Answer

Dear student Question is not clear Please attach an image, We will happy to help you Good Luck Cheers

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p { margin-bottom: 0.25cm; line-height: 120%; } If A+B+C+D=2S,prove that cos 2 S+cos 2 (S-A)+cos 2 (S-B)+cos 2 (S-C)=2+2cosAcosBcosC

p { margin-bottom: 0.25cm; line-height: 120%; }
If A+B+C+D=2S,prove that
cos²S+cos²(S-A)+cos²(S-B)+cos²(S-C)=2+2cosAcosBcosC

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p { margin-bottom: 0.25cm; line-height: 120%; } If A+B+C+D=2S,prove that cos 2 S+cos 2 (S-A)+cos 2 (S-B)+cos 2 (S-C)=2+2cosAcosBcosC

p { margin-bottom: 0.25cm; line-height: 120%; }If A+B+C+D=2S,prove thatcos2S+cos2(S-A)+cos2(S-B)+cos2(S-C)=2+2cosAcosBcosC

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p { margin-bottom: 0.25cm; line-height: 120%; }
If A+B+C+D=2S,prove that
cos²S+cos²(S-A)+cos²(S-B)+cos²(S-C)=2+2cosAcosBcosC