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Latihan Soal #27 [B] .Trigonometri Dasar (Sudut Istimewa), Cos^2 30O + Sin^2 30O – 2 Cos 90O =

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Latihan Soal #27 [B] .Trigonometri Dasar (Sudut Istimewa), Cos^2 30O + Sin^2 30O – 2 Cos 90O =