Cos² 6α + 4Sin²3αCos²3α = Cos²6α + (2Sin3αCos3α)² =
= Cos²6α + Sin²6α = 1
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Cos² 6α + 4Sin²3αCos²3α = Cos²6α + (2Sin3αCos3α)² =
= Cos²6α + Sin²6α = 1