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Prove that: (sin(A-B))/(sinAsinB)=(sin...

Prove that:
`(sin(A-B))/(sinAsinB)=(sinAcosB-cosAsinB)/(sinAsinB)`
`(sinAcosB)/(sinAsinB)-(cosAsinB)/(sinCsinA)`
`=cotB-cotA-cotC`
=0 = RHS Hence Proved.

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