Trigonometry: Double-Angle Identities

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Solve for all solutions on the interval $[0,2\pi)$

\\\cos(6x)-\cos(3x)=0.

Choose all correct answers

Option A: A

$0$

Option B: B

$\frac{2\pi}{3}$

Option C: C

$\frac{4\pi}{3}$

Option D: D

$\frac{2\pi}{9}$

Option E: E

$\frac{4\pi}{9}$

Option F: F

$\frac{8\pi}{9}$

Option G: G

$\frac{10\pi}{9}$

Option H: H

$\frac{14\pi}{9}$

Option I: I

$\frac{16\pi}{9}$

Option J: J

$\frac{20\pi}{9}$

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