1.

gsoo-gurs _ gsoo guis (७(g—o0)ms 0s00 OUIS

Answer»

Let alpha = A, beta = BLHS: sin A/sin B - cos A/cos B= (sinAcosB - cosAsinB)/ sinB.cosB[ Using sin(x - y) = sinx.cosy - cosx.siny] = sin(A - B) / sinB.cosB= RHS

Hence proved



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