What is the general solution for cos(θ)= 2/3 ,-(5pi)/2 ,2pi ?

The general solution for cos(θ)= 2/3 ,-(5pi)/2 ,2pi is No Solution for θ\in\mathbb{R}

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cos(θ)= 2/3 ,-(5pi)/2 ,2pi

cos (θ) = \frac{2}{3}, - \frac{5 π}{2}, 2 π

No Solution for θ \in R

Solution steps

cos (θ) = \frac{2}{3}, - \frac{5 π}{2}, 2 π

Apply trig inverse properties

θ = arccos (\frac{2}{3}) + 2 πn, θ = 2 π - arccos (\frac{2}{3}) + 2 πn

Solutions for the range

- \frac{5 π}{2}

No Solution for θ \in R

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x, arctan (x) = \frac{π}{4}

cos (2 θ) + 3 cos (θ) = 1

What is the general solution for cos(θ)= 2/3 ,-(5pi)/2 ,2pi ?
The general solution for cos(θ)= 2/3 ,-(5pi)/2 ,2pi is No Solution for θ\in\mathbb{R}