Page 134 - E-Modul Matematika Fase E [Kelas X]
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E. Sudut Berelasi Trigonometri
Di bagian ini akan membahas mengenai rumus rasio trigonometri sudut yang berelasi di
semua kuadran.
1. Kuadran I (0 < < 90 )
Berikut rumus sudut relasi di kuadran I:
sin(90 − ) = cos cosec(90 − ) = sec
cos(90 − ) = sin sec(90 − ) = cosec
tan(90 − ) = cot cot(90 − ) = tan
2. Kuadran II (90 < < 180 )
sin(90 + ) = cos cosec(90 + ) = sec
cos(90 + ) = − sin sec(90 + ) = − cosec
tan(90 + ) = − cot cot(90 + ) = − tan
3. Kuadran III (180 < < 270 )
sin(270 − ) = − cos cosec(270 − ) = − sec
cos(270 − ) = − sin sec(270 − ) = − cosec
tan(270 − ) = cot cot(270 − ) = tan
4. Kuadran IV (270 < < 360 )
sin(− ) = − cos cosec(− ) = − sec
cos(− ) = sin sec(− ) = cosec
tan(− ) = − cot cot(− ) = − tan
MODUL MATEMATIKA FASE E - SMA KELAS X
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