`2cos x-1=0 `

`<=>cos x=1/2`

`<=>x= pi/3 +2 kpi (k in ZZ) or x=-pi/3+2kpi (k in ZZ)`

**Set of solutions** `pi/3+2kpi or -pi/3+2kpi (kin ZZ)`

`2cosx=1=>`

`cosx=1/2=>`

`x=cos^(-1)(1/2)+2kPi=>`

`x=Pi/3+2kPi` for k=0,1,2,...

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