What is the general solution for cos^2(θ)-cos(θ)-20=0 ?

The general solution for cos^2(θ)-cos(θ)-20=0 is No Solution for θ\in\mathbb{R}

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cos^2(θ)-cos(θ)-20=0

cos^{2} (θ) - cos (θ) - 20 = 0

No Solution for θ \in R

Solution steps

cos^{2} (θ) - cos (θ) - 20 = 0

Solve by substitution

cos (θ) = 5, cos (θ) = - 4

cos (θ) = 5 :

No Solution

cos (θ) = - 4 :

No Solution

Combine all the solutions

No Solution for θ \in R

100.0191 = 180 - arctan (\frac{3.9254}{0.6936 - x})

- 9 sin (x) = 0

4 csc (θ) - 1 = - cot (θ) + 3 csc (θ)

cos (2 x) = \frac{7}{9}

- 2 tan (θ) = - tan^{2} (θ) - 1

What is the general solution for cos^2(θ)-cos(θ)-20=0 ?
The general solution for cos^2(θ)-cos(θ)-20=0 is No Solution for θ\in\mathbb{R}