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Question
Find the general solution of the following equation:
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Solution
We have:
⇒ \[\cos3x = \cos \frac{\pi}{3}\]
⇒ \[3x = 2n\pi \pm \frac{\pi}{3}\]
⇒ \[x = \frac{2n\pi}{3} \pm \frac{\pi}{9}\]
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