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OpenStudy (anonymous):

my question is [ SinA Sin(B-C)+SinB Sin(C-A) + SinC Sin(A-B) ]=0

OpenStudy (anonymous):

Lol, this is history section. :P

OpenStudy (anonymous):

1/2[cos(a-b+c)-cos(a+b-c)+cos(b-c+a)-cos(b+c-a)+cos(c-a+b)-cos(c+a-b)]=0 it's done ........ the subtract ...you will get correct result .......

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