Evaluate -sin C-A sin C sin A if none of sin A- sin B- sin C is zero-

∑sin(C A)sinCsinA =∑sinCcosA cosCsinAsinCsinA =∑sinCcosAsinCsinA ∑cosCsinAsinCsinA =∑cosAsinA ∑cosCsinC =∑A C =A C+C B+B A=0 ...

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Cosine Rule

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Question

Evaluate $\sum \frac{sin (C - A)}{sin C sin A}$ if none of $sin A, sin B, sin C$ is zero.

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