Solve Graphically 15cos(x)^2+8cos(x)+1=0

$15 \cos^{2} (x) + 8 \cos (x) + 1 = 0$

Graph each side of the equation. The solution is the x-value of the point of intersection.

$x \approx 1.77215424 + 2 π n, 1.91063323 + 2 π n, 4.37255207 + 2 π n, 4.51103105 + 2 π n$ , for any integer $n$

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