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Sin = Sisi depan : Sisi Miring
Cos = Sisi Samping : Sisi Miring
Tan = Sisi depan : Sisi Samping
Kalo menurutku mirip2 rumus phytagoras sih..
cos=sami (sisi samping/sisi miring)
tan= desa(sisi depan/sisi samping)
kalo mau cepat hapal, singkatannya itu aja
terimakasih