cos2x-cos6x=0 на отрезке [-П/2;П]
2sin4xsin2x=0
sin2x=0 x=Пk/2 [-П/2;0;П/2;П]
sin4x=0 x=Пk/4 [-П/4;П/4;3П/4]
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2sin4xsin2x=0
sin2x=0 x=Пk/2 [-П/2;0;П/2;П]
sin4x=0 x=Пk/4 [-П/4;П/4;3П/4]