Nilai sin x,cos x,dan an x 120°

sin 120
= sin (180-60)
= sin 60
= 1/2 akar 3

cos 120
= cos (180-60)
= -cos 60
= -1/2

tan 120
= tan (180-60)
= -tan 60
= -akar 3

mohon maaf bila salah...