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

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

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cos^2(x)-7cos(x)+12=0

cos^{2} (x) - 7 cos (x) + 12 = 0

No Solution for x \in R

Solution steps

cos^{2} (x) - 7 cos (x) + 12 = 0

Solve by substitution

cos (x) = 4, cos (x) = 3

cos (x) = 4 :

No Solution

cos (x) = 3 :

No Solution

Combine all the solutions

No Solution for x \in R

2 sin^{2} (x) + sin (x) - 1 = 0, 0 \leq x \leq 2 π

2 sin (e^{\frac{t}{4}}) + 1 = 0

3 sin^{2} (x) - 2 sin (x) = 0

sin (u) = - \frac{2}{5}

2 sin (3 x) cos (2 x) - cos (2 x) = 0

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