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If A+B+C = 2S SinS + Sin(S-A) + Sin(S-B)-sin(S-c)=? If A+B+C = 2S SinS + Sin(S-A) + Sin(S-B)-sin(S-c)=?
sinS+sin(S-A)+sin(S-B)-sin(S-C){sinS-sin(S-C)}+{sin(S-A)+sin(S-B)}2cos(2S-C)/2sin(C/2)+2sin(C/2)cos(B-A)/2=2sinC/2[cos(A+B)/2 +cos(B-A)/2]=2sinC/2 .[2cos(B/2)cos(A/2)]=4cos(A/2)cos(B/2)sin(C/2)Thanks & RegardsRinkoo GuptaaskIITians Faculty
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