Question 944548
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Solve the equation 4 times cosine of theta plus 1 = 2 times cosine of theta 
for theta greater than or equal to 0 but less than 2 pi.
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        The solution in the post by @lwsshar3 is incorrect.

        I came to bring a correct solution.



4cos(x) + 1 = 2cos(x)
2cos(x) + 1 = 0
cos(x) = -1/2
x = 2π/3, 4π/3   &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<<<---===  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>


Solved correctly.