Solve cos(3x)=sin(x)\cos(3x) = \sin(x)cos(3x)=sin(x) for x∈[0,π]x \in [0, \pi]x∈[0,π].
π8,3π8,5π8,7π8\frac{\pi}{8}, \frac{3\pi}{8}, \frac{5\pi}{8}, \frac{7\pi}{8}8π,83π,85π,87π
π4,3π4\frac{\pi}{4}, \frac{3\pi}{4}4π,43π
π8,5π8\frac{\pi}{8}, \frac{5\pi}{8}8π,85π
3π8,7π8\frac{3\pi}{8}, \frac{7\pi}{8}83π,87π