Solve the equation\(8{cos}^{4} \theta -5cos(2 \theta )-2=0\)for \(0\leq \theta \leq \pi\), giving yo

Solve the equation\(8{cos}^{4} \theta -5cos(2 \theta )-2=0\)for \(0\leq \theta \leq \pi\), giving yo - চর্চা