Find exactly all solutions to the given equation cos 2cos0 0

Find exactly all solutions to the given equation.

cos 2+cos=0, 0°<360°

Enter your answers in increasing order.

cos 2+cos=0

2cos²-1+cos=0

2cos²+cos-1=0

2cos²+2cos-cos-1=0

2cos(cos+1) -1(cos+1)=0

(cos+1)(2cos -1)=0

cos=-1,cos=1/2

cos=-1 =>=180^o

,cos=1/2=>=60⁰,300⁰

so =60^o,180^o,300^o