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Solve:
sin2x - sin4x + sin6x = 0
sin6x + sin2x - sin4x = 0
2sin4x × cos2x - sin4x = 0
sin4x (2cos2x - 1) = 0
sin4x = 0 or cos2x = 1/2
sin4x = 0 or cos2x = cos π/3
4x = nπ or 2x = 2nπ ± π/3, where n ∈ Ζ
x = nπ/4 or x = nπ ± π/6, where n ∈ Ζ