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√2 cos(x-π/4). Cos(2x−π4)−1=0. √2cos(x-π/4)-cosx=-√3/2. Cos π/2.
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√2 cos(x-π/4). Cos(2x−π4)−1=0. √2cos(x-π/4)-cosx=-√3/2. Cos π/2. 