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If A+B+C+D=2S,prove that

cos2S+cos2(S-A)+cos2(S-B)+cos2(S-C)=2+2cosAcosBcosC

Subhajit Dhar , 8 Years ago
Grade 11
anser 2 Answers
Saurabh Koranglekar
Dear student

Please check the question

If you check values at s= 90, A = 45
Lhs=! Rhs

Regards

Last Activity: 6 Years ago
Vikas TU
Dear student 
Question is not clear 
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We will happy to  help you 
Good Luck
Cheers
 
Last Activity: 6 Years ago
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