Jika cosec alpa =3 dan alpa terletak di kuadran 1 maka cos alpa =
Jawaban Terkonfirmasi
Bab Trigonometri
Matematika SMA Kelas X
cosec α = 3
1/sin α = 3
sin α = 1/3
cos α = √(1 – sin² α)
cos α = √(1 – (1/3)²)
cos α = √(9/9 – 1/9)
cos α = √(8/9)
cos α = (2/3) . √2