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Sudut negatif.
sin(-150) = -sin(150)
= -sin(180-30)
Aturan kuadran 2.
= -sin(30)
= -1/2
Nomor 2.
cos(135) = cos(180-45)
Aturan kuadran 2.
= -cos 45
= -1/2 √2
Nomor 3.
tan(225) = tan(180+45)
Aturan kuadran 3.
= tan 45
= 1
Nomor 4.
cos(300) = cos(360-60)
Aturan kuadran 4.
= cos 60
= 1/2
Nomor 5.
sin(330) = sin(360-30)
Aturan kuadran 4.
= -sin 30
= -1/2
Nomor 6.
cos(450) = cos(360+90)
Perputaran
= cos(90)
= 0
Nomor 7.
tan(660) = tan(360+300)
= tan(300)
= tan(360-60)
Aturan kuadran 4.
= -tan 60
= -√3
Nomor 8.
sin(870) = sin(720+150)
Aturan rotasi
= sin(150)
= sin(180-30)
Aturan kuadran 2.
= sin 30
= 1/2
Nomor 9.
sin(-45) = -sin(45)
Aturan sudut negatif pada sinus.
= -1/2 √2
Nomor 10.
cos(-135) = cos(135)
Aturan sudut negatif pada cosinus.
= cos(180-45)
= -cos(45)
= -1/2 √2
Nomor 11.
tan(-390) = -tan(390)
Aturan sudut negatif pada tangen
= -tan(360+30)
Aturan rotasi.
= -tan 30
= -1/3 √3
Nomor 12.
sin(-1260) = -sin(1260)
= -sin(1080+180)
= -sin(180)
= -sin(180-0)
= -sin 0
= 0