Penjelasan dengan langkah-langkah:
sin α = 4/5
interval 90° < α < 180° → kuadran 2
x = √(5²-4²) = √(25-16) = √9 = 3
cos α = –3/5 → cos di kuadran 2 bernilai negatif
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Penjelasan dengan langkah-langkah:
sin α = 4/5
interval 90° < α < 180° → kuadran 2
x = √(5²-4²) = √(25-16) = √9 = 3
cos α = –3/5 → cos di kuadran 2 bernilai negatif