Cos120derajat +sin60derajat+tan 30derajat

Cos 120 + Sin 60 + tan 30
= Cos (180 - 60) + Sin 60 + Tan 30
= - Cos 60 + Sin 60 + Tan 30
= - 1/2 + 1/2 √3 + 1/3 √3
= - 1/2 + (3√3+2√3)/6
= 5/6 √3 - 1/2
= 1/2 (5/3 √3 - 1)

Semoga bermanfaat yaaaa