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Sin x / Cos x = 3
Tan x = 3
Sin 2x = 2.Sin x.Cos x
Sin 2x = 2.3.Cos x.Cos x
Sin 2x = 6. Cos² x
ingat Tan² x + 1 = 1/Cos² x
jadi 3² + 1 = 1/Cos² x
Cos² x = 1/10
jadi Sin 2x = 6.(1/10)
Sin 2x = 6/10 = 3/5