What is the general solution for 3cos^2(x)+2cos(x)-8=0 ?

The general solution for 3cos^2(x)+2cos(x)-8=0 is No Solution for x\in\mathbb{R}

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3cos^2(x)+2cos(x)-8=0

3 cos^{2} (x) + 2 cos (x) - 8 = 0

No Solution for x \in R

Solution steps

3 cos^{2} (x) + 2 cos (x) - 8 = 0

Solve by substitution

cos (x) = \frac{4}{3}, cos (x) = - 2

cos (x) = \frac{4}{3} :

No Solution

cos (x) = - 2 :

No Solution

Combine all the solutions

No Solution for x \in R

tan (a) + sec (a) = \frac{3}{2}

3 cos^{2} (x) + 4 cos^{4} (x) - 5 = 0

cos (2 x + 3) = 0

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

5 tan (y) - 1 = \frac{1}{5 tan ( y )}

What is the general solution for 3cos^2(x)+2cos(x)-8=0 ?
The general solution for 3cos^2(x)+2cos(x)-8=0 is No Solution for x\in\mathbb{R}