Tolong kerjain... tentang trigonometri
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AC/(1/2) =10/(1/2 V2)
AC =5V2
BC^2 =AB^2+AC^2-2AB.AC.COS 60
=(10v2)^2+(5v2)^2-2.10v2.5v2.1/2
=200+50-100
BC^2 =150
BC =5V6