tolong dijawab in yg bisa ya thx (pakai cara)

1) sin 300 = sin (360-60) = -sin 60 = -½√3

2) cos 1200 = cos (3.360 + 120)
= cos 120 = cos (180-60) = -cos 60 = -½

3) sin 45.cos 30 + cos 45.sin 30
= (√2/2)(√3/2) + (√2/2)(1/2)
= ¼√2 (√3 + 1)
bisa sampai situ ajah