1/21 cos (8x -π/8)≥√3/42 с решением - вопрос №521936312188342 от ринат127 02.01.2020 15:54

Question

Алгебра: 1/21 cos (8x -π/8)≥√3/42 с решением

ринат127 · Answer

Cos(8x-π/8)≥√3*21/42cos(8x-π/8)≥√3/22πn-π/6≤8х-π/8≤2πn+π/6, n∈Z2πn-π/6+π/8≤8х≤2πn+π/6+π/82πn-π/24≤8х≤2πn+7π/24πn/4-π/192≤х≤πn/4+7π/192x∈[πn/4-π/192; πn/4+7π/192]...