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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
Dear studentPlease check the questionIf you check values at s= 90, A = 45Lhs=! RhsRegards
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