If A+B+C = 2S SinS + Sin(S-A) + Sin(S-B)-sin(S-c)=?

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Rinkoo Gupta · Answer

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 & Regards Rinkoo Gupta askIITians Faculty

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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)=?

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