Jika cos 2x = -2/3 dari 90<=2x<=180. Nilai 0<=x<=2x. Nilai

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Jika cos 2x = -2/3 dari 90<=2x<=180. Nilai 0<=x<=2x. Nilai sin x = ....
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Jika cos 2x = -2/3 dari 90<=2x<=180. Nilai 0<=x<=2x. Nilai sin x = ....