1+(cos4x)/tg(3п/4-2x)
G(3П/4-2x) = (1-cos(3П/2-4x)) / sin(3П/2-4x) = -(1+sin4x) / cos(4x)1 + (cos4x/tg 3П/4-2x) = 1-cos^4x / (1+sin4x) = (1+sin^4x-cos^4x) / (1+sin4x) = (1-cos8x) / (sin2x+cos2x)