16.
sinA≠0,sinB≠0,sinC≠0
(6sinA-2sinC)cosB+sin(C-B)=sinA
6sinAcosB-sinCcosB-cosCsinB=sinA
6sinAcosB-sin(B+C)=sinA
6sinAcosB-sinA=sinA
cosB=1/3
sinB=(2√2)/3
S△ABC=(1/2)acsinB
b²=a²+c²-2accosB
16.
sinA≠0,sinB≠0,sinC≠0
(6sinA-2sinC)cosB+sin(C-B)=sinA
6sinAcosB-sinCcosB-cosCsinB=sinA
6sinAcosB-sin(B+C)=sinA
6sinAcosB-sinA=sinA
cosB=1/3
sinB=(2√2)/3
S△ABC=(1/2)acsinB
b²=a²+c²-2accosB