Question 951507
{{{Let v=cos(x)}}};


{{{2v^2-3v+1=0}}}
{{{(2v-1)(v-1)=0}}}
{{{v=1/2}}}  or  {{{v=1}}}
;


Either {{{cos(x)=1/2}}}  OR  {{{cos(x)=1}}}.


Possible x values,  0, pi/3