apabila cos x + 2 sin 1/6 phi ÷ sin 5/3 phi - cos phi = 1 maka x

cosx+2sin30°= sin300°-cos180°
cosx+2.1/2= 1/2√3+1
cosx+1= 1/2√3+1
cosx= 1/2√3
x= 30°