Finding roots of trigonometric equation

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Hi everyone!
I try to find the roots of the trigonometric equation below between 0 and 2*pi, but I have a logaritmic expression as an answer.
(-log(root(z^4 - (5*z^3*exp(13i/25))/11 - (5*z*exp(13i/25))/11 + exp(26i/25), z, 1))*1i)
How can I find the roots of this equation in the that interval?
Thank you in advance.
syms theta
vr=cos(theta)-2.2*cos(2*theta-0.52);
roots=solve(vr,theta)

Accepted Answer

madhan ravi
madhan ravi on 5 Feb 2019
Roots=solve(vr,theta,'maxDegree',4)

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