Question 1198604
.
<pre>

The given equation  2*cos(x) - 1 = 0 is equivalent to 

    2*cos(x) = 1,  or  cos(x) = {{{1/2}}},


which has the roots  x = {{{pi/3}}}  and  x = {{{5pi/3}}}  in the interval [0,{{{2pi}}}) and has no other roots in this interval. 


<U>ANSWER</U>.  Option E).
</pre>

Solved.


-----------------


By the way, &nbsp;interval &nbsp;[{{{0}}},{{{2pi}}}] &nbsp;is shown &nbsp;INCORRECTLY &nbsp;in your post.


The standard and traditional notation for this interval is &nbsp;[{{{0}}},{{{2pi}}})

&nbsp;with the curved closing parenthesis.



As you write it incorrectly, &nbsp;I can make my conclusion about your mathematical competency.