jika sudut a kuadran II dan sin a = 1/2 akar 3 maka tan a

sin a = 1/2 akar3
sin a = sin 120°
a = 120°

tan a = tan120° = -akar3

Bab Trigonometri
Matematika SMA Kelas X

kuadran II
sin a = (1/2) √3
a = 120°

tan a
= tan 120°
= tan (180° - 60°)
= - tan 60°
= -√3