`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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