Mathematics, 10.04.2021 05:50 mahalabear8120

If A+B+C=180 Then prove that
cos(B+C-A)+cos(C+A-B)+cos(A+B-C)= 1+4CosA. cosB. cosC

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If A+B+C=180 Then prove that
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If A+B+C=180 Then prove thatcos(B+C-A)+cos(C+A-B)+cos(A+B-C)= 1+4CosA. cosB. cosC​

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Another question on Mathematics

If A+B+C=180 Then prove that
cos(B+C-A)+cos(C+A-B)+cos(A+B-C)= 1+4CosA. cosB. cosC