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Tg t cos. CTG 2t cos2t-1 +1. Cos2t-sin2t. TG T CTG T. Sin2(t)-2sin(t)/cos(t)-1.
CTG 2t cos2t-1 +1. Cos2t-sin2t. TG T CTG T. Sin2(t)-2sin(t)/cos(t)-1.

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