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tan = depan/samping
depan = 3
samping = 4
maka miring = 5
sin A = depan/miring
sin A = 3/5
cos A = samping/miring
cos A = 4/5
sin 2A = 2 sin A cos A
= 2 (3/5) (4/5)
= 24/25
Jadi, nilai sin 2A = 24/25