Pola (lihat di kanan tanda =)
Sin → Sin
Cos → Cos
Tan → Tan
1. (180o – α) –> Kuadran II
sin (180o – α) = sin α
cos (180o – α) = -cosα
tan (180o – α) = sin α
2. (180o + α) –> Kuadran III
sin (180o + α) = -sin α
cos (180o + α) = -cosα
tan (180o + α) = sin α
3. (360o – α) –> Kuadran IV
sin (360o – α) = -sin α
cos (360o – α) = cosα
tan (360o – α) = -sin α
4. (360o + α) –> Kuadran I
sin (360o + α) = sin α
cos (360o + α) = cosα
tan (360o + α) = sin α
Pola (lihat di kanan tanda =)
Sin → Cos
Cos → Sin
Tan → Cot
5. untuk sudut (-α) –> Kuadran IV
sin (-α) = -sin α
cos (-α) = cosα
tan (-α) = -sin α
6. (90o – α) –> Kuadran I
sin (90o – α) = cos α
cos (90o – α) = sin α
tan (90o – α) = cot α
7. (90o + α) –> Kuadran II
sin (90o + α) = cos α
cos (90o + α) = -sin α
tan (90o + α) = -cot α
8. (270o – α) –> Kuadran III
sin (270o – α) = -cos α
cos (270o – α) = -sin α
tan (270o – α) = cot α
9. (270o + α) –> Kuadran IV
sin (270o + α) = -cos α
cos (270o + α) = sin α
tan (270o + α) = -cot α