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Bahan Ajar Trigonometri
c. Sudut 0 dan 90
0
0
Y
P ( , )
X
Gambar 5
Jika titik P( , ) mendekati sumbu X dan berhimpit dengan sumbu X, maka = ,
∠ = 0 , = 0. Maka:
0
0
0
0
Sin 0 = = = 0 Sec 0 = = ⬚ = ⬚
⬚ ⬚
0
0
Cos 0 = = ⬚ = ⬚ Cosec 0 = = ⬚ = ⬚
⬚ ⬚ ⬚ ⬚
⬚
0
0
Tan 0 = = = ⬚ Cotan 0 = = ⬚ = ⬚
⬚ ⬚ ⬚ ⬚
Jika titik P( , ) mendekati sumbu Y dan berhimpit dengan sumbu Y, maka = ,
∠ = 90 , = 0. Maka:
0
0
0
Sin 90 = = = 1 Sec 90 = = ⬚ = ⬚
⬚ ⬚
0
0
Cos 90 = = ⬚ = ⬚ Cosec 90 = = ⬚ = ⬚
⬚ ⬚ ⬚ ⬚
0
⬚
⬚
0
Tan 90 = = = ⬚ Cotan 90 = = = ⬚
⬚ ⬚ ⬚ ⬚
0
0
0
0
0
0
0
0
0 0 30 45 60 90 120 135 150 180
Sin
Cos
Tan
Sec
Cosec
Cotan
8
