Matematika

Berapakah nilai sin 120°?

Berapakah nilai sin 120°?

Jawaban:√3/2

Dari rumus trignometrik

Sin (90 + x) = cos x

Jadi sin 120° dapat ditulis sebagai

Sin (90°+ 30°) = cos 30°

Nilai sin

sin 0° = (0/4) = 0

sin 30° = (1/4) =

sin 45° = (2/4) = 1/√2

sin 60° = 3/4 = 3/2

cos 90° = (4/4) = 1

Nilai Cos

cos 0° = (4/4) = 1

cos 30° = (3/4) = 3/2

cos 45° = (2/4) = 1/√2

cos 60° = (1/4) = 1/2

cos 90° = (0/4) = 0

Dari daftar nilai cos di atas

Cos 30° = 3/2

Jadi

Sin (120°) = Sin (90°+ 30°) = cos 30° = 3/2

10