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Tg 2t. Cos2t формула. Упростить cos(4t)cos(2t)-sin(2t)-cos(2t). Cos2t-cos2t/1-cos2t упростить. Sin2t+cos2t 1.
Cos2t формула. Упростить cos(4t)cos(2t)-sin(2t)-cos(2t). Cos2t-cos2t/1-cos2t упростить. Sin2t+cos2t 1.

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