The general solution of $\cos x = 1/2$ is:
A$x = n\pi + \pi/3$ for any integer $n$ in the school chart
B$x = 2n\pi + \pi/6$ for any integer $n$ on the chart
C$x = n\pi \pm \pi/6$ for any integer $n$ in the formula
D$x = 2n\pi \pm \pi/3$ for any integer $n$ here on the chart
Answer & Solution
Correct answer: D. $x = 2n\pi \pm \pi/3$ for any integer $n$ here on the chart
$\cos x = \cos(\pi/3) \Rightarrow x = 2n\pi \pm \pi/3$.
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