Ответ:x∈(-π/4+πn;π/4+πn,n∈z)
Объяснение:cos2x>0
-π/2+2πn<2x<π/2+2πn,n∈z
-π/4+πn<x<π/4+πn,n∈z
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Ответ:x∈(-π/4+πn;π/4+πn,n∈z)
Объяснение:cos2x>0
-π/2+2πn<2x<π/2+2πn,n∈z
-π/4+πn<x<π/4+πn,n∈z