(1+cos(2п-2a))ctg(3п/2+а) = (1+cos2а)(-tgа) = 2cos²а(-tgа) = -2cosаsinа = -sin2а
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(1+cos(2п-2a))ctg(3п/2+а) = (1+cos2а)(-tgа) = 2cos²а(-tgа) = -2cosаsinа = -sin2а