Mohon bantuannya ya Tks

12.
α = 4/3 π = 4/3 * 180° = 240°

1/√3 tan α sin α + cos α

= 1/√3 tan 240° sin 240° + cos 240°

= 1/√3 tan (270° - 30°) sin (270° - 30°) + cos (270° - 30°)

= 1/√3 * cot 30° * (- cos 30°) + (- sin 30

= 1/√3 * √3 * (- 1/2 √3) - 1/2

= (- 1/2 √3) - 1/2

= - √3/2 - 1/2