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Cos (x/6 + π/4) = √2/2. Cos(x+π/4). √2cos(x-π/4)-cosx=-√3/2. , √2cos(π :4 -х :3) - cos x:3 =√3:2.
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Cos (x/6 + π/4) = √2/2. Cos(x+π/4). √2cos(x-π/4)-cosx=-√3/2. , √2cos(π :4 -х :3) - cos x:3 =√3:2. 