What is the general solution for cos^2(θ)-7cos(θ)+12=0 ?

The general solution for cos^2(θ)-7cos(θ)+12=0 is No Solution for θ\in\mathbb{R}

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cos^2(θ)-7cos(θ)+12=0

cos^{2} (θ) - 7 cos (θ) + 12 = 0

No Solution for θ \in R

Solution steps

cos^{2} (θ) - 7 cos (θ) + 12 = 0

Solve by substitution

cos (θ) = 4, cos (θ) = 3

cos (θ) = 4 :

No Solution

cos (θ) = 3 :

No Solution

Combine all the solutions

No Solution for θ \in R

cos^{2} (x) = cos^{2} (\frac{x}{2})

csc^{2} (θ) - csc (θ) - 20 = 0

sec^{2} (θ) + 7 sec (θ) + 6 = 0

cos (x) = \frac{3}{8}

- 1 = cos (x)

What is the general solution for cos^2(θ)-7cos(θ)+12=0 ?
The general solution for cos^2(θ)-7cos(θ)+12=0 is No Solution for θ\in\mathbb{R}