Solve cos(2x)+sin(x)=0\cos(2x) + \sin(x) = 0cos(2x)+sin(x)=0 for x∈[0,2π]x \in [0, 2\pi]x∈[0,2π].
\pi/6, 5\pi/6, 3\pi/2
\pi/2, 7\pi/6, 11\pi/6
\pi/3, 2\pi/3, 3\pi/2
\pi/6, 7\pi/6, 3\pi/2