If A+B-C=3pi (540 degree) then SinA+SinB-SinC is equal to
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Sina +sin b - sinc =
sina + sin b - sin(3π -a -b)
Sina + sinb - sin(-a-b)
Sina +sinb +sin(a+b)
Sina + sinb +sinacosb + cosasinb
Sina(1 + cosb) + sinb ( 1+ cosa)
sina + sin b - sin(3π -a -b)
Sina + sinb - sin(-a-b)
Sina +sinb +sin(a+b)
Sina + sinb +sinacosb + cosasinb
Sina(1 + cosb) + sinb ( 1+ cosa)
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